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Fluorlamprophyllite
A valid IMA mineral species
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About Fluorlamprophyllite
Formula:
Na3(SrNa)Ti3(Si2O7)2O2F2
Colour:
Brownish-orange
Lustre:
Adamantine
Hardness:
3
Specific Gravity:
3.484 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after its relation to lamprophyllite.
Type Locality:
Unique Identifiers
Mindat ID:
46037
Long-form identifier:
mindat:1:1:46037:8
IMA Classification of Fluorlamprophyllite
Approved
IMA Formula:
(SrNa)Ti4+2Na3Ti4+(Si2O7)2O2F2
Approval year:
2013
First published:
2018
Type description reference:
Andrade, Marcelo B., Yang, Hexiong, Downs, Robert T., Färber, Gunnar, Contreira Filho, Reynaldo R., Evans, Stanley H., Loehn, Clayton W., Schumer, Benjamin N. (2018) Fluorlamprophyllite, Na3(SrNa)Ti3(Si2O7)2O2F2, a new mineral from Poços de Caldas alkaline massif, Morro do Serrote, Minas Gerais, Brazil. Mineralogical Magazine, 82 (1) 121-131 doi:10.1180/minmag.2017.081.027
Classification of Fluorlamprophyllite
9.BE.25
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
Mineral Symbols
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 |
|---|---|---|
| Flmp | 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 Fluorlamprophyllite
Adamantine
Transparency:
Transparent
Colour:
Brownish-orange
Streak:
Pale yellow
Hardness:
3 on Mohs scale
Comment:
~3
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
on {100}
Parting:
None observed
Density:
3.484 g/cm3 (Calculated)
Optical Data of Fluorlamprophyllite
Type:
Biaxial (+)
RI values:
nα = 1.735(7) nβ = 1.749(7) nγ = 1.775(9)
2V:
Measured: 72° (3)
Max. Birefringence:
δ = 0.040
Based on recorded range of RI values above.
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.
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.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
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.
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.
Chemistry of Fluorlamprophyllite
Mindat Formula:
Na3(SrNa)Ti3(Si2O7)2O2F2
Element Weights:
Crystallography of Fluorlamprophyllite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.255(2) Å, b = 7.0715(7) Å, c = 5.3807(6) Å
β = 96.794(2)°
β = 96.794(2)°
Ratio:
a:b:c = 2.723 : 1 : 0.761
Unit Cell V:
727.5 ų
Morphology:
Bladed crystals
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.1468 Å | (60) |
| 3.7255 Å | (36) |
| 3.3935 Å | (20) |
| 3.2012 Å | (21) |
| 2.7765 Å | (100) |
| 2.1336 Å | (32) |
| 1.7686 Å | (24) |
| 1.5992 Å | (22) |
Geological Environment
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 Fluorlamprophyllite
General Appearance of Type Material:
Bladed brownish-orange crystals
Place of Conservation of Type Material:
In the collections of the University of Arizona Mineral Museum, Tucson, Arizona, USA, catalogue number 19589, and the RRUFF Project, deposition number R130421
Geological Setting of Type Material:
Alkaline massif
Associated Minerals at Type Locality:
Reference:
Andrade, Marcelo B., Yang, Hexiong, Downs, Robert T., Färber, Gunnar, Contreira Filho, Reynaldo R., Evans, Stanley H., Loehn, Clayton W., Schumer, Benjamin N. (2018) Fluorlamprophyllite, Na3(SrNa)Ti3(Si2O7)2O2F2, a new mineral from Poços de Caldas alkaline massif, Morro do Serrote, Minas Gerais, Brazil. Mineralogical Magazine, 82 (1) 121-131 doi:10.1180/minmag.2017.081.027
Synonyms of Fluorlamprophyllite
Other Language Names for Fluorlamprophyllite
Dutch:Fluorlamprophylliet
German:Fluorlamprophyllit
Relationship of Fluorlamprophyllite to other Species
Member of:
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 |
| 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/c |
| Nechelyustovite | (Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2O | Mon. 2/m : B2/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 Associates
Associations Based on Photo Data:
| 9 photos of Fluorlamprophyllite associated with Aegirine | NaFe3+Si2O6 |
| 8 photos of Fluorlamprophyllite associated with Fluorbarytolamprophyllite | (Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2] |
| 8 photos of Fluorlamprophyllite associated with Microcline | K(AlSi3O8) |
| 8 photos of Fluorlamprophyllite associated with Sodalite | Na4(Si3Al3)O12Cl |
| 4 photos of Fluorlamprophyllite associated with Nepheline | Na3K(Al4Si4O16) |
| 1 photo of Fluorlamprophyllite associated with Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
Related Minerals - Strunz-mindat Grouping
| 9.BE. | Zinkgruvanite | Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2 |
| 9.BE. | Calciomurmanite | (Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4 |
| 9.BE. | Cámaraite | Ba3Na(Fe2+,Mn)8Ti4(Si2O7)4O4(OH,F)7 |
| 9.BE. | Alfredcasparite | Sr2TiO(Si2O7) |
| 9.BE. | Batievaite-(Y) | Y2Ca2Ti(Si2O7)2(OH)2(H2O)4 |
| 9.BE. | Nacareniobsite-(Y) | Na3Ca3YNb(Si2O7)2OF3 |
| 9.BE. | Alexkuznetsovite-(Ce) | Ce2Mn(CO3)(Si2O7) |
| 9.BE. | Bobshannonite | Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2 |
| 9.BE. | Paralomonosovite | Na6◻4Ti4(Si2O7)2[PO3OH][PO2(OH)2]O2(OF) |
| 9.BE. | Madeiraite | Na2Ca2Fe2Zr2(Si2O7)2O2F2 |
| 9.BE. | Bortolanite | Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2 |
| 9.BE. | Longshoushanite-(Ce) | Ce4MgAl2Ti2(Si2O7)2O8 |
| 9.BE. | Moxuanxueite | NaCa6Zr(Si2O7)2OF3 |
| 9.BE. | Delhuyarite-(Ce) | Ce4Mg(Fe3+,W)3◻(Si2O7)2O6(OH)2 |
| 9.BE. | Christofschäferite-(Ce) | Ce3CaMnTiFe3+Ti2(Si2O7)2O8 |
| 9.BE.X | Asimowite | Fe2+4O(Si2O7) |
| 9.BE. |
Morro do Serrote, Poços de Caldas, Minas Gerais, Brazil