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Nechelyustovite

A valid IMA mineral species

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Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite, etc.

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite, etc.

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Nechelyustovite

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

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About NechelyustoviteHide

Formula:

(Ba,Sr,K)₂(Na,Ti,Mn)₄(Ti,Nb)₂(Si₂O₇)₂O₂(O,H₂O,F)₂ · 4.5H₂O

Colour:

creamy with greyish, bluish or yellowish shades

Lustre:

Vitreous, Pearly

Hardness:

Specific Gravity:

3.32

Crystal System:

Monoclinic

Member of:

Lamprophyllite Group > Seidozerite Supergroup

Name:

Named in honor of Georgii Nikolayevich Nechelyustov (Георгий Николаевич Нежаблубов) (b. 1939), a noted Russian electron microprobe analyst of new mineral species, in particular titano-silicates.

Type Locality:

ⓘ Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Found as -1M and -2M polytypes.

Unique IdentifiersHide

Mindat ID:

29548

Long-form identifier:

mindat:1:1:29548:2

IMA Classification of NechelyustoviteHide

IMA status:

Approved

IMA Formula:

(Na◻)◻₂Ba₄Ti⁴⁺₄Nb⁵⁺₄(Na₁₁◻)Ti⁴⁺₄(Si₂O₇)₈O₈(OH)₈(H₂O)₁₂

Approval year:

2006

Classification of NechelyustoviteHide

Strunz-mindat (2026):

9.BE.55

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si₂O₇ groups, with additional anions; cations in octahedral [6] and greater coordination

Dana 8th ed.:

56.2.10.6

56 : SOROSILICATES Si₂O₇ Groups, With Additional O, OH, F and H₂O
2 : Si₂O₇ Groups and O, OH, F, and H₂O with cations in [4] and/or >[4] coordination

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Nec	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of NechelyustoviteHide

Lustre:

Vitreous, Pearly

Transparency:

Transparent, Translucent

Colour:

creamy with greyish, bluish or yellowish shades

Hardness:

3 on Mohs scale

Tenacity:

Brittle

Cleavage:

Perfect
{001} perfect and {100} medium

Parting:

none

Fracture:

Irregular/Uneven

Density:

3.32 g/cm³ (Measured) 3.42 g/cm³ (Calculated)

Optical Data of NechelyustoviteHide

Type:

Biaxial (+)

RI values:

n_α = 1.700(3) n_β = 1.710(3) n_γ = 1.734(3)

2V:

Calculated: 66°

Max. Birefringence:

δ = 0.034
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

nondiscernable

Pleochroism:

Non-pleochroic

Chemistry of NechelyustoviteHide

Mindat Formula:

(Ba,Sr,K)₂(Na,Ti,Mn)₄(Ti,Nb)₂(Si₂O₇)₂O₂(O,H₂O,F)₂ · 4.5H₂O

Element Weights:

Element	% weight
O	38.144 %
Ba	29.103 %
Si	11.904 %
Ti	10.144 %
Na	9.744 %
H	0.961 %

Calculated from ideal end-member formula.

Elements listed:

Ba, F, H, K, Mn, Na, Nb, O, Si, Sr, Ti - search for minerals with similar chemistry

Crystallography of NechelyustoviteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

B2/m

Setting:

C2/m

Cell Parameters:

a = 5.37 Å, b = 7 Å, c = 24.05 Å
β = 91.1°

Ratio:

a:b:c = 0.767 : 1 : 3.436

Unit Cell V:

903.87 Å³ (Calculated from Unit Cell)

Comment:

A2/m (2M polytype)

Crystal StructureHide

Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

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CIF File Best | x | y | z | a | b | c

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014594	Nechelyustovite	Camara F, Sokolova E (2009) From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral Khibina alkaline massif, Kola peninsula, Russia Mineralogical Magazine 73 753-775		2009	hydrothermally altered pegmatite, Kirovskii mine, Mt Kukisvumchorr,	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Nechelyustovite'
loop_
_publ_author_name
'Camara F'
'Sokolova E'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 73 
_journal_year 2009
_journal_page_first 753
_journal_page_last 775
_publ_section_title
;
 From structure topology to chemical composition. X. Titanium silicates: the crystal
 structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral
 Khibina alkaline massif, Kola peninsula, Russia
;
_database_code_amcsd 0014594
_chemical_compound_source 'hydrothermally altered pegmatite, Kirovskii mine, Mt Kukisvumchorr,'
_chemical_formula_sum 'Ti4.14 Mn1.44 Na4.2 Ca.4 Nb1.43 Al.04 Fe.06 Si8 Ba1.28 Sr.5 K.3 O42 H16'
_cell_length_a 5.447
_cell_length_b 7.157
_cell_length_c 47.259
_cell_angle_alpha 97.759
_cell_angle_beta 92.136
_cell_angle_gamma 89.978
_cell_volume 1824.198
_exptl_crystal_density_diffrn      3.043
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
TiMO(1)   0.80800   0.88800   0.33360   0.67000   0.02200
MnMO(1)   0.80800   0.88800   0.33360   0.33000   0.02200
TiMO(2)   0.91500   0.25300   0.12660   1.00000   0.02500
NaMO(3)   0.80300   0.39200   0.33990   0.70000   0.00500
NaMO(4)   0.93200   0.75700   0.12400   0.70000   0.00700
NaMO(5)   0.30000   0.13000   0.33590   0.46000   0.01200
MnMO(5)   0.30000   0.13000   0.33590   0.37000   0.01200
CaMO(5)   0.30000   0.13000   0.33590   0.10000   0.01200
NaMO(6)   0.30400   0.64500   0.33600   0.50000   0.01000
MnMO(6)   0.30400   0.64500   0.33600   0.28000   0.01000
CaMO(6)   0.30400   0.64500   0.33600   0.22000   0.01000
NaMO(7)   0.42700   0.00500   0.12460   0.65000   0.02100
MnMO(7)   0.42700   0.00500   0.12460   0.20000   0.02100
CaMO(7)   0.42700   0.00500   0.12460   0.08000   0.02100
NaMO(8)   0.43000   0.49600   0.12430   0.69000   0.02000
MnMO(8)   0.43000   0.49600   0.12430   0.26000   0.02000
NbMH(1)   0.27000   0.71360   0.06000   0.66000   0.02200
TiMH(1)   0.27000   0.71360   0.06000   0.34000   0.02200
NbMH(2)   0.46800   0.43560   0.40070   0.57000   0.02500
TiMH(2)   0.46800   0.43560   0.40070   0.43000   0.02500
TiMH(3)   0.12600   0.34300   0.27150   0.96000   0.02400
AlMH(3)   0.12600   0.34300   0.27150   0.04000   0.02400
TiMH(4)   0.59700   0.79000   0.18680   0.74000   0.01900
NbMH(4)   0.59700   0.79000   0.18680   0.20000   0.01900
Fe3+MH(4)   0.59700   0.79000   0.18680   0.06000   0.01900
Si(1)   0.62900   0.63500   0.27570   1.00000   0.00700
Si(2)   0.63100   0.08300   0.27660   1.00000   0.01300
Si(3)   0.96700   0.14200   0.39300   1.00000   0.01100
Si(4)   0.96500   0.71200   0.39350   1.00000   0.01800
Si(5)   0.08900   0.50700   0.18380   1.00000   0.00200
Si(6)   0.09800   0.08400   0.18390   1.00000 ?
Si(7)   0.76600   0.42280   0.06730   1.00000   0.01400
Si(8)   0.77500   0.00800   0.06727   1.00000   0.02100
BaAP(1)   0.11720   0.82670   0.24360   0.59000   0.01100
SrAP(1)   0.11720   0.82670   0.24360   0.23000   0.01100
KAP(1)   0.11720   0.82670   0.24360   0.14000   0.01100
BaAP(2)   0.61150   0.30690   0.21490   0.53000   0.00500
SrAP(2)   0.61150   0.30690   0.21490   0.21000   0.00500
KAP(2)   0.61150   0.30690   0.21490   0.12000   0.00500
BaAP(3)   0.47700   0.95400   0.43180   0.16000   0.01200
SrAP(3)   0.47700   0.95400   0.43180   0.06000   0.01200
KAP(3)   0.47700   0.95400   0.43180   0.04000   0.01200
NaAP(4)   0.27300   0.21800   0.05050   0.50000   0.01300
O(1)   0.62800   0.65600   0.30930   1.00000 ?
O(2)   0.38300   0.52100   0.26290   1.00000 ?
O(3)   0.87500   0.53700   0.26560   1.00000   0.00100
O(4)   0.59300   0.84900   0.26460   1.00000   0.00900
O(5)   0.38100   0.15100   0.26200   1.00000   0.01700
O(6)   0.61100   0.08500   0.31060   1.00000   0.00100
O(7)   0.88200   0.13900   0.26250   1.00000   0.03000
O(8)   0.71600   0.22900   0.40380   1.00000   0.02700
O(9)   0.23922   0.19603   0.40394   1.00000   0.02300
O(10)   0.97000   0.10600   0.35840   1.00000   0.00500
O(11)   0.99300   0.94300   0.40540   1.00000   0.04000
O(12)   0.73700   0.61900   0.40620   1.00000   0.05000
O(13)   0.22800   0.63200   0.40520   1.00000   0.00600
O(14)   0.97200   0.70000   0.35780   1.00000   0.01900
O(15)   0.07000   0.46300   0.14940   1.00000   0.01900
O(16)   0.87200   0.62300   0.19950   1.00000 ?
O(18)   0.08000   0.30400   0.19870   1.00000 ?
O(17)   0.35200   0.59200   0.19690   1.00000   0.02500
O(19)   0.34100  -0.01800   0.19730   1.00000 ?
O(20)   0.85800  -0.01400   0.19560   1.00000 ?
O(21)   0.07300   0.06800   0.15020   1.00000 ?
O(22)   0.01300   0.50900   0.05440   1.00000   0.00700
O(23)   0.51700   0.51600   0.05640   1.00000   0.07000
O(24)   0.80200   0.45100   0.10120   1.00000   0.01700
O(25)   0.78500   0.20770   0.05250   1.00000   0.00600
O(26)   0.80600   0.02900   0.10082   1.00000   0.03000
O(27)  -0.01000   0.89200   0.05050   1.00000   0.03200
O(28)   0.52200   0.88300   0.05510   1.00000   0.01200
OXOM(1)   0.28600   0.72600   0.09700   1.00000   0.01200
OXOM(2)   0.46400   0.39500   0.36330   1.00000   0.03000
OXOM(3)   0.14800   0.36300   0.30690   1.00000   0.00300
OXOM(4)   0.58300   0.76300   0.15020   1.00000   0.01800
O-HXOA(1)   0.51900   0.90800   0.35890   1.00000   0.02900
O-HXOA(2)   0.08300   0.87400   0.30910   1.00000   0.00200
O-HXOA(3)   0.63800   0.26300   0.14780   1.00000   0.04000
O-HXOA(4)   0.22700   0.24200   0.10370   1.00000   0.01200
WatXPM(1)   0.74400   0.31300  -0.01010   1.00000   0.04000
WatXPM(2)   0.48800   0.47200   0.45070   1.00000   0.03000
WatXPA(1)   0.26200   0.26300   0.00420   1.00000   0.04300
WatXPA(2)   0.24177   0.17071   0.47177   0.25000   0.03000
WatXPA(3)   0.69676   0.75637   0.47072   0.25000   0.06000
Wat(1)  -0.00800   0.52400   0.45440   1.00000   0.05500
Wat(2)   0.89600   0.32800   0.49760   1.00000   0.09400
Wat(3)   0.17247   0.00281   0.49839   0.50000   0.01000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
TiMO(1) 0.02000 0.00600 0.04100 0.00100 -0.01300 0.00300
MnMO(1) 0.02000 0.00600 0.04100 0.00100 -0.01300 0.00300
TiMO(2) 0.02700 0.02200 0.02300 -0.00200 -0.01200 0.00200
NaMO(7) 0.01500 0.02100 0.02900 0.00800 0.01400 0.00900
MnMO(7) 0.01500 0.02100 0.02900 0.00800 0.01400 0.00900
CaMO(7) 0.01500 0.02100 0.02900 0.00800 0.01400 0.00900
NaMO(8) 0.00500 0.01400 0.04000 0.00300 0.00900 -0.00300
MnMO(8) 0.00500 0.01400 0.04000 0.00300 0.00900 -0.00300
NbMH(1) 0.01400 0.01600 0.03600 -0.00300 0.00200 0.00400
TiMH(1) 0.01400 0.01600 0.03600 -0.00300 0.00200 0.00400
NbMH(2) 0.01700 0.02200 0.03700 -0.00100 0.00600 0.00800
TiMH(2) 0.01700 0.02200 0.03700 -0.00100 0.00600 0.00800
TiMH(3) 0.01100 0.02900 0.03300 0.00000 -0.00500 0.00200
AlMH(3) 0.01100 0.02900 0.03300 0.00000 -0.00500 0.00200
TiMH(4) 0.00900 0.01500 0.03400 0.00000 0.00200 0.00700
NbMH(4) 0.00900 0.01500 0.03400 0.00000 0.00200 0.00700
Fe3+MH(4) 0.00900 0.01500 0.03400 0.00000 0.00200 0.00700
BaAP(1) 0.00500 0.00500 0.02300 -0.00100 0.00000 0.00000
SrAP(1) 0.00500 0.00500 0.02300 -0.00100 0.00000 0.00000
KAP(1) 0.00500 0.00500 0.02300 -0.00100 0.00000 0.00000
BaAP(2) 0.00200 0.00500 0.00800 0.00100 0.00200 0.00300
SrAP(2) 0.00200 0.00500 0.00800 0.00100 0.00200 0.00300
KAP(2) 0.00200 0.00500 0.00800 0.00100 0.00200 0.00300

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
24.06 Å	(100)
7.05 Å	(9)
5.95 Å	(97)
3.95 Å	(6)
2.828 Å	(16)
2.712 Å	(19)
2.155 Å	(13)

Locality:

Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of NechelyustoviteHide

Type Locality:

ⓘ Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia

General Appearance of Type Material:

rosettes up to 1–5 cm in diameter composed of extremely fine (0.01–0.1 mm) bounded flakes and lamellae

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii Pr. 18/2, 117071 Moscow, Russia (catalogue number 3437/1)

Geological Setting of Type Material:

hydrothermally altered pegmatite body emplaced in the nepheline syenites near their contact with ijolite–urtites

Associated Minerals at Type Locality:

Barytolamprophyllite

Natrolite

Synonyms of NechelyustoviteHide

IMA2006-021

Other Language Names for NechelyustoviteHide

Dutch:Nechelyustoviet

German:Nechelyustovit

Relationship of Nechelyustovite to other SpeciesHide

Member of:

Lamprophyllite Group > Seidozerite Supergroup

Other Members of Lamprophyllite Group:

Barytolamprophyllite	(Ba,Na)₂(Na,Ti,Fe³⁺)₄Ti₂(Si₂O₇)₂O(OH,F)	Mon.
Bornemanite	Na₆BaTi₂Nb(Si₂O₇)₂(PO₄)O₂(OH)F	Tric. 1 : P1
Delindeite	(Na,K)₂(Ba,Ca)₂(Ti,Fe,Al)₃(Si₂O₇)₂O₂(OH)₂ · 2H₂O	Mon. 2/m : B2/m
Emmerichite	Ba₂Na(Na,Fe²⁺)₂(Fe³⁺,Mg)Ti₂(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
Epistolite	(Na◻)Nb₂Na₃Ti(Si₂O₇)₂O₂(OH)₂(H₂O)₄	Tric. 1 : P1
Fluorbarytolamprophyllite	(Ba,Sr)₂[(Na,Fe²⁺)₃(Ti,Mg)F₂][Ti₂(Si₂O₇)₂O₂]	Mon. 2/m : B2/m
Fluorlamprophyllite	Na₃(SrNa)Ti₃(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
Innelite	Ba₄Ti₂Na(NaMn²⁺)Ti(Si₂O₇)₂[(SO₄)(PO₄)]O₂[O(OH)]	Tric. 1 : P1
Kazanskyite	BaNa₃Ti₂Nb(Si₂O₇)₂O₂(OH)₂(H₂O)₄	Tric. 1 : P1
Lamprophyllite	(Na,Mn²⁺)₃(Sr,Na)₂(Ti,Fe³⁺)₃(Si₂O₇)₂O₂(OH,O,F)₂	Mon. 2/m
Lileyite	Ba₂(Na,Fe,Ca)₃MgTi₂(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
Nabalamprophyllite	(BaNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂	Mon. 2/m : P2/m
Phosphoinnelite	Na₃Ba₄Ti₃(Si₂O₇)₂(PO₄,SO₄)₂O₂F	Tric.
Polyphite	Na₅(Na₄Ca₂)Ti₂(Si₂O₇)(PO₄)₃O₂F₂	Tric. 1 : P1
Saamite	Ba◻Na₃Ti₂Nb(Si₂O₇)₂O₂(OH)F(H₂O)₂	Tric. 1 : P1
Shkatulkalite	Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O)₄(H₂O)₃	Tric. 1 : P1
Vuonnemite	Na₁₁Ti⁴⁺Nb₂(Si₂O₇)₂(PO₄)₂O₃(F,OH)	Tric.
Zvyaginite	NaZnNb₂Ti[Si₂O₇]₂(OH,F)₃(H₂O)_4+x (x < 1)	Tric. 1 : P1

Common AssociatesHide

Associations Based on Photo Data:

2 photos of Nechelyustovite associated with Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
2 photos of Nechelyustovite associated with Aegirine	NaFe³⁺Si₂O₆
1 photo of Nechelyustovite associated with Gaidonnayite	Na₂Zr(Si₃O₉) · 2H₂O
1 photo of Nechelyustovite associated with Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O

Related Minerals - Strunz-mindat Grouping Hide

9.BE.	Zinkgruvanite	Ba₄Mn²⁺₄Fe³⁺₂(Si₂O₇)₂(SO₄)₂O₂(OH)₂	Tric. 1 : P1
9.BE.	Calciomurmanite	(Na,◻)₂Ca(Ti,Mg,Nb)₄[Si₂O₇]₂O₂(OH,O)₂(H₂O)₄	Tric. 1 : P1
9.BE.	Cámaraite	Ba₃Na(Fe²⁺,Mn)₈Ti₄(Si₂O₇)₄O₄(OH,F)₇	Tric. 1
9.BE.	Alfredcasparite	Sr₂TiO(Si₂O₇)	Tet. 4mm : P4bm
9.BE.	Batievaite-(Y)	Y₂Ca₂Ti(Si₂O₇)₂(OH)₂(H₂O)₄	Tric. 1 : P1
9.BE.	Nacareniobsite-(Y)	Na₃Ca₃YNb(Si₂O₇)₂OF₃	Mon. 2/m : P2₁/b
9.BE.	Alexkuznetsovite-(Ce)	Ce₂Mn(CO₃)(Si₂O₇)	Mon. 2/m : P2₁/b
9.BE.	Bobshannonite	Na₂KBa(Mn,Na)₈(Nb,Ti)₄(Si₂O₇)₄O₄(OH)₄(O,F)₂	Tric.
9.BE.	Paralomonosovite	Na₆◻₄Ti₄(Si₂O₇)₂[PO₃OH][PO₂(OH)₂]O₂(OF)	Tric. 1 : P1
9.BE.	Madeiraite	Na₂Ca₂Fe₂Zr₂(Si₂O₇)₂O₂F₂	Mon. 2/m : P2₁/b
9.BE.	Bortolanite	Ca₂(Ca_1.5Zr_0.5)Na(NaCa)Ti(Si₂O₇)₂(OF)F₂	Tric. 1 : P1
9.BE.	Longshoushanite-(Ce)	Ce₄MgAl₂Ti₂(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.	Moxuanxueite	NaCa₆Zr(Si₂O₇)₂OF₃	Tric. 1 : P1
9.BE.	Delhuyarite-(Ce)	Ce₄Mg(Fe³⁺,W)₃◻(Si₂O₇)₂O₆(OH)₂	Mon. 2/m : B2/m
9.BE.	Christofschäferite-(Ce)	Ce₃CaMnTiFe³⁺Ti₂(Si₂O₇)₂O₈	Mon. 2/m : P2₁/m
9.BE.X	Asimowite	Fe²⁺₄O(Si₂O₇)	Orth. mmm(2/m2/m2/m) : Imma
9.BE.	Biraite-(La)	La₂Fe²⁺(CO₃)(Si₂O₇)	Mon. 2/m : P2₁/b
9.BE.	Pilanesbergite	Na₂Ca₂Fe₂Ti₂(Si₂O₇)₂O₂F₂	Mon. 2/m : P2₁/b
9.BE.02	Wadsleyite	Mg₄O(Si₂O₇)	Orth. mmm(2/m2/m2/m) : Imma
9.BE.02	Ohtaniite	Mg₃(Si_0.5◻_0.5)Si₂O₈	Orth. mmm(2/m2/m2/m) : Imma
9.BE.05	Lawsonite	CaAl₂(Si₂O₇)(OH)₂ · H₂O	Orth. mmm(2/m2/m2/m) : Cmcm
9.BE.05	Hennomartinite	SrMn³⁺₂(Si₂O₇)(OH)₂ · H₂O	Orth. mmm(2/m2/m2/m) : Cmcm
9.BE.05	Cortesognoite	CaV₂(Si₂O₇)(OH)₂ · H₂O	Orth. mmm(2/m2/m2/m) : Cmcm
9.BE.05	Noelbensonite	BaMn³⁺₂(Si₂O₇)(OH)₂ · H₂O	Orth. mm2
9.BE.05	Itoigawaite	SrAl₂(Si₂O₇)(OH)₂ · H₂O	Orth. mmm(2/m2/m2/m) : Cmcm
9.BE.07	Ilvaite	CaFe³⁺Fe²⁺₂(Si₂O₇)O(OH)	Orth. mmm(2/m2/m2/m)
9.BE.07	Amamoorite	CaMn²⁺₂Mn³⁺(Si₂O₇)O(OH)	Mon. 2/m : P2₁/b
9.BE.07	Manganilvaite	CaFe²⁺Fe³⁺Mn²⁺(Si₂O₇)O(OH)	Mon. 2/m : P2₁/b
9.BE.10	Suolunite	Ca₂(H₂Si₂O₇) · H₂O	Orth. mm2 : Fdd2
9.BE.12	Jaffeite	Ca₆(Si₂O₇)(OH)₆	Trig. 3 : P3
9.BE.15	Fresnoite	Ba₂Ti(Si₂O₇)O	Tet. 4mm : P4bm
9.BE.17	Janhaugite	(Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂	Mon. 2/m : P2₁/m
9.BE.17	Burpalite	Na₂CaZr(Si₂O₇)F₂	Mon. 2/m : P2₁/b
9.BE.17	Niocalite	(Ca,Nb)₄(Si₂O₇)(O,OH,F)₂	Mon. m
9.BE.17	Normandite	NaCa(Mn,Fe)(Ti,Nb,Zr)(Si₂O₇)OF	Mon. 2/m : P2₁/b
9.BE.17	Hiortdahlite	Na₂Ca₄(Ca_0.5Zr_0.5)Zr(Si₂O₇)2OF₃	Tric. 1 : P1
9.BE.17	Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂	Mon. 2/m : P2₁/b
9.BE.17	Cuspidine	Ca₈(Si₂O₇)₂F₄	Mon. 2/m : P2₁/b
9.BE.17	Wöhlerite	Na₂Ca₄ZrNb(Si₂O₇)₂O₃F	Mon. 2 : P2₁
9.BE.17	Baghdadite	Ca₆Zr₂(Si₂O₇)₂O₄	Mon. 2/m : P2₁/b
9.BE.20	Nacareniobsite-(Ce)	Na₃Ca₃(Ce,REE)Nb(Si₂O₇)₂OF₃	Mon. 2/m : P2₁/b
9.BE.20	Roumaite	(Ca,Na,REE,◻)₇(Nb,Ti)[Si₂O₇]₂OF₃	Mon. m : Bb
9.BE.20	Rinkite-(Ce)	(Ca₃Ce)Na(NaCa)Ti(Si₂O₇)₂(OF)F₂	Mon. 2/m : P2₁/b
9.BE.20	Nacareniobsite-(Nd)	Ca₂(CaNd)Na₃Nb(Si₂O₇)₂(OF)F₂	Mon. 2/m : P2₁/b
9.BE.20	Rinkite-(Y)	Na₂Ca₄YTi(Si₂O₇)₂OF₃	Mon. 2/m : P2₁/b
9.BE.20	Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂	Mon. 2/m : P2₁/b
9.BE.22	Hainite-(Y)	Na₂Ca₄(Y,REE)Ti(Si₂O₇)₂OF₃	Tric. 1 : P1
9.BE.22	Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆	Tric. 1 : P1
9.BE.22	Götzenite	NaCa₆Ti(Si₂O₇)₂OF₃	Tric. 1 : P1
9.BE.22	Fogoite-(Y)	Na₃Ca₂Y₂Ti(Si₂O₇)₂OF₃	Tric. 1 : P1
9.BE.22	Kochite	Na₃Ca₂MnZrTi(Si₂O₇)₂OF₃	Tric. 1 : P1
9.BE.23	Dovyrenite	Ca₆Zr(Si₂O₇)₂(OH)₄	Orth. mmm(2/m2/m2/m) : Pnnm
9.BE.25	Lamprophyllite	(Na,Mn²⁺)₃(Sr,Na)₂(Ti,Fe³⁺)₃(Si₂O₇)₂O₂(OH,O,F)₂	Mon. 2/m
9.BE.25	Seidozerite	Na₄MnZr₂Ti(Si₂O₇)₂O₂F₂	Mon. 2/m : P2/b
9.BE.25	Nabalamprophyllite	(BaNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂	Mon. 2/m : P2/m
9.BE.25	Schüllerite	Ba₂Na(Mn,Ca)(Fe³⁺,Mg,Fe²⁺)₂Ti₂(Si₂O₇)₂(O,F)₄	Tric. 1 : P1
9.BE.25	Ericssonite	BaMn²⁺₂Fe³⁺(Si₂O₇)O(OH)	Mon. 2/m : B2/m
9.BE.25	Grenmarite	Na₄MnZr₃(Si₂O₇)₂O₂F₂	Mon. 2/m : P2/b
9.BE.25	Kazanskyite	BaNa₃Ti₂Nb(Si₂O₇)₂O₂(OH)₂(H₂O)₄	Tric. 1 : P1
9.BE.25	Saamite	Ba◻Na₃Ti₂Nb(Si₂O₇)₂O₂(OH)F(H₂O)₂	Tric. 1 : P1
9.BE.25	Emmerichite	Ba₂Na(Na,Fe²⁺)₂(Fe³⁺,Mg)Ti₂(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
9.BE.25	Barytolamprophyllite	(Ba,Na)₂(Na,Ti,Fe³⁺)₄Ti₂(Si₂O₇)₂O(OH,F)	Mon.
9.BE.25	'Ericssonite-2O'	BaMn²⁺₂Fe³⁺(Si₂O₇)O(OH)	Orth.
9.BE.25	Fluorbarytolamprophyllite	(Ba,Sr)₂[(Na,Fe²⁺)₃(Ti,Mg)F₂][Ti₂(Si₂O₇)₂O₂]	Mon. 2/m : B2/m
9.BE.25	Fluorlamprophyllite	Na₃(SrNa)Ti₃(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
9.BE.25	Lileyite	Ba₂(Na,Fe,Ca)₃MgTi₂(Si₂O₇)₂O₂F₂	Mon. 2/m : B2/m
9.BE.27	Kolskyite	CaNa₂Ti₄(Si₂O₇)₂O₄(H₂O)₇	Tric. 1 : P1
9.BE.27	Vigrishinite	NaZnTi₄(Si₂O₇)₂O₃(OH)(H₂O)₄	Tric. 1 : P1
9.BE.27	Selivanovaite	NaFe³⁺Ti₄(Si₂O₇)₂O₄(H₂O)₄	Tric. 1 : P1
9.BE.27	Murmanite	Na₂Ti₂(Si₂O₇)O₂ · 2H₂O	Tric. 1 : P1
9.BE.30	Epistolite	(Na◻)Nb₂Na₃Ti(Si₂O₇)₂O₂(OH)₂(H₂O)₄	Tric. 1 : P1
9.BE.32	Lomonosovite	Na₅Ti₂(Si₂O₇)(PO₄)O₂	Tric. 1 : P1
9.BE.35	Vuonnemite	Na₁₁Ti⁴⁺Nb₂(Si₂O₇)₂(PO₄)₂O₃(F,OH)	Tric.
9.BE.37	Sobolevite	Na₁₃Ca₂Mn₂Ti₃(Si₂O₇)₂(PO₄)₄O₃F₃	Mon. m : Pb
9.BE.40	Ferroinnelite	Ba₄Ti₂Na(NaFe²⁺)Ti(Si₂O₇)₂[(SO₄)(PO₄)]O₂[O(OH)]	Tric. 1 : P1
9.BE.40	Phosphoinnelite	Na₃Ba₄Ti₃(Si₂O₇)₂(PO₄,SO₄)₂O₂F	Tric.
9.BE.40	Innelite	Ba₄Ti₂Na(NaMn²⁺)Ti(Si₂O₇)₂[(SO₄)(PO₄)]O₂[O(OH)]	Tric. 1 : P1
9.BE.42	Yoshimuraite	Ba₂Mn₂Ti(Si₂O₇)(PO₄)O(OH)	Tric. 1 : P1
9.BE.42	Horiite	Ba₂Mn₂Mn₄Ti₂(Si₂O₇)₂(PO₄)₂O₂(OH)₂	Tric. 1 : P1
9.BE.45	Quadruphite	Na₆Na₂(CaNa)₂Na₂Ti₂Na₂Ti₂(Si₂O₇)₂(PO₄)₄O₄F₂	Tric. 1 : P1
9.BE.47	Polyphite	Na₅(Na₄Ca₂)Ti₂(Si₂O₇)(PO₄)₃O₂F₂	Tric. 1 : P1
9.BE.50	Shkatulkalite	Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O)₄(H₂O)₃	Tric. 1 : P1
9.BE.50	Bornemanite	Na₆BaTi₂Nb(Si₂O₇)₂(PO₄)O₂(OH)F	Tric. 1 : P1
9.BE.55	Hejtmanite	Ba₂Mn²⁺₄Ti₂(Si₂O₇)₂O₂(OH)₂F₂	Tric. 1
9.BE.55	Bykovaite	(Ba,Na,K)₂(Na,Ti,Mn)₄(Ti,Nb)₂(Si₂O₇)₂O₂(H₂O,F,OH)₂ · 3.5H₂O	Mon. 2/m
9.BE.55	Bafertisite	Ba₂Fe²⁺₄Ti₂(Si₂O₇)₂O₂(OH)₂F₂	Tric.
9.BE.60	Delindeite	(Na,K)₂(Ba,Ca)₂(Ti,Fe,Al)₃(Si₂O₇)₂O₂(OH)₂ · 2H₂O	Mon. 2/m : B2/m
9.BE.62	'Orthochevkinite'	(Ce,La,Ca,Na,Th)₄(Fe²⁺,Mg)₂(Ti,Fe³⁺)₃Si₄O₂₂	Orth.
9.BE.62 va	'Strontium Perrierite'	(Ce,Sr,La,Ca)₄Fe²⁺(Ti,Zr,Fe)₂Ti₂(Si₂O₇)₂O₈
9.BE.62	'Chevkinite-(Nd)'	(Nd,REE)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂(Si₂O₇)₂O₈ ?
9.BE.62	'Perrierite-(Nd)'	Nd₄MgFe³⁺₂Ti₂(Si₂O₇)₂O₈ ?
9.BE.65	Bussenite	Na₂Ba₂Fe²⁺Ti(Si₂O₇)(CO₃)(OH)₃F	Tric. 1 : P1
9.BE.67	Jinshajiangite	BaNaFe²⁺₄Ti₂(Si₂O₇)₂O₂(OH)₂F	Tric. 1 : P1
9.BE.67	Perraultite	BaNaMn²⁺₄Ti₂(Si₂O₇)₂O₂(OH)₂F	Tric. 1
9.BE.70	Dingdaohengite-(Ce)	(Ce,La)₄Fe²⁺(Ti,Fe²⁺,Mg,Fe³⁺)₂Ti₂(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.70	Perrierite-(Ce)	Ce₄MgFe³⁺₂Ti₂(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.70	Karnasurtite-(Ce)	(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si₂O₇)(OH)₄ · 3H₂O	Amor.
9.BE.70	Maoniupingite-(Ce)	(Ce,Ca)₄(Fe³⁺,Ti,Fe²⁺,◻)(Ti,Fe³⁺,Fe²⁺,Nb)₄(Si₂O₇)₂O₈	Mon. 2/m : B2/m
9.BE.70	Matsubaraite	Sr₄Ti₅(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.70	Rengeite	Sr₄ZrTi₄(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.70	Polyakovite-(Ce)	(Ce,Ca)₄(Mg,Fe²⁺)(Cr³⁺,Fe³⁺)₂(Ti,Nb)₂(Si₂O₇)₂O₈	Mon. 2/m : B2/m
9.BE.70	Hezuolinite	(Sr,REE)₄Zr(Ti,Fe³⁺)₄(Si₂O₇)₂O₈	Mon. 2/m : B2/m
9.BE.70	'UM2008-53-SiO:SrTiZr'	Sr₄ZrTi₄(Si₂O₇)₂O₈	Orth. mmm(2/m2/m2/m) : Pbca
9.BE.70	Chevkinite-(Ce)	Ce₄(Ti,Fe²⁺,Fe³⁺)₅O₈(Si₂O₇)₂	Mon. 2/m : P2₁/b
9.BE.70	Perrierite-(La)	(La,Ce,Ca)₄(Fe²⁺,Mn)(Ti,Fe³⁺,Al)₄[(Si₂O₇)O₄]₂	Mon. 2/m : P2₁/b
9.BE.70	Strontiochevkinite	(Sr,La,Ce,Ca)₄Fe²⁺(Ti,Zr)₂Ti₂(Si₂O₇)₂O₈	Mon. 2/m : P2₁/b
9.BE.72	Fersmanite	Ca₄(Na,Ca)₄(Ti,Nb)₄(Si₂O₇)₂O₈F₃	Tric.
9.BE.75	Belkovite	Ba₃(Nb,Ti)₆(Si₂O₇)₂O₁₂	Hex. 6m2 : P62m
9.BE.77	Nasonite	Pb₆Ca₄(Si₂O₇)₃Cl₂	Hex. 6/m : P6₃/m
9.BE.80	Melanotekite	Pb₂Fe³⁺₂(Si₂O₇)O₂	Orth. 222 : C222₁
9.BE.80	Kentrolite	Pb₂Mn³⁺₂(Si₂O₇)O₂	Orth. mmm(2/m2/m2/m) : Pbcm
9.BE.82	Alexkuznetsovite-(La)	La₂Mn(CO₃)(Si₂O₇)	Mon. 2/m : P2₁/b
9.BE.82	Tilleyite	Ca₅(Si₂O₇)(CO₃)₂	Mon. 2/m : P2₁/b
9.BE.85	Killalaite	Ca_6.4(H_0.6Si₂O₇)₂(OH)₂	Mon. 2/m : P2₁/m
9.BE.87	Stavelotite-(La)	(La,Nd,Ca)₃Mn²⁺₃Cu(Mn³⁺,Fe³⁺,Mn⁴⁺)₂₆(Si₂O₇)₆O₃₀	Trig. 3 : P3₁
9.BE.90	Magnesiorowlandite-(Y)	Y₄(Mg,Fe)(Si₂O₇)₂F₂	Tric. 1 : P1
9.BE.90	Biraite-(Ce)	Ce₂Fe²⁺(Si₂O₇)(CO₃)	Mon. 2/m : P2₁/b
9.BE.92	Cervandonite-(Ce)	(Ce,Nd,La)(Fe³⁺,Fe²⁺,Ti,Al)₃O₂(Si₂O₇)(As³⁺O₃)(OH)	Trig. 3m : R3m
9.BE.92	Chirvinskyite	(Na,Ca)₁₃(Fe,Mn,◻)₂(Ti,Zr)₅(Si₂O₇)₄(OH,O)₁₂ · 2H₂O	Tric. 1 : P1
9.BE.95	Rusinovite	Ca₁₀(Si₂O₇)₃Cl₂	Orth. mmm(2/m2/m2/m) : Cmcm
9.BE.95	Batisivite	BaV³⁺₈Ti₆(Si₂O₇)O₂₂	Tric. 1 : P1
9.BE.97	Schlüterite-(Y)	(Y,REE)₂AlSi₂O₇(OH)₂F	Mon. 2/m : P2₁/b