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Deloneite
A valid IMA mineral species
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About Deloneite
Boris N. Delone
Formula:
(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
Colour:
Bright yellow
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.92
Crystal System:
Trigonal
Member of:
Name:
Named in 1996 by Alexander Petrovich Khomyakov, D.V. Lisitin, I.M. Kulikova, and R.K. Rastsvetaeva in honor of Boris Nikolaevich Delone (Delaunay) (15 March 1890, Saint Petersburg, Russian Empire - 17 July 1980, Moscow, Soviet Union), mathematical crystallographer and mountain climber. Originally named deloneite-(Ce). Renamed to deloneite by the IMA in 2010 because the REE does not exist at any sites in higher proportions than other cations.
Type Locality:
This page provides mineralogical data about Deloneite.
Unique Identifiers
Mindat ID:
6900
Long-form identifier:
mindat:1:1:6900:3
Similar Names
| Delanouite | A synonym of 'Delanovite' | |
| Dellenite | A synonym of 'Rhyodacite' | |
| Dillnite | A variety of Zunyite | Al13Si5O20(OH,F)18Cl |
IMA Classification of Deloneite
Approved
IMA status notes:
Redefined by the IMA
Approval year:
1995
First published:
1996
Classification of Deloneite
8.BN.05
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
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 |
|---|---|---|
| Dln | 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 Deloneite
Vitreous
Transparency:
Transparent
Colour:
Bright yellow
Streak:
White
Hardness:
5 on Mohs scale
Fracture:
Step-Like
Density:
3.92(5) g/cm3 (Measured) 3.95 g/cm3 (Calculated)
Optical Data of Deloneite
Type:
Uniaxial (-)
RI values:
nω = 1.682(2) nε = 1.66(2)
Max. Birefringence:
δ = 0.022
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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Deloneite
Mindat Formula:
(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
Element Weights:
Crystallography of Deloneite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 9.51(1) Å, c = 7.01(1) Å
Ratio:
a:c = 1 : 0.737
Unit Cell V:
549.05 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0012350 | Deloneite | Rastsvetaeva R K, Khomyakov A P (1996) Structural features of a new naturally occurring representative of the fluorapatite-deloneite series Crystallography Reports 41 789-792 | 1996 | Khibini alkaline massif, Kola Peninsula, Russia | 0 | 293 | |
| 0012491 | Deloneite | Rastsvetaeva R F, Khomyakov A P (1996) Crystal structure of deloneite-(Ce), high ordered Ca analogue of belovite Doklady Akademii Nauk SSSR 349 354-357 | 1996 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.84 Å | (100 broad) |
| 3.12 Å | (40) |
| 2.753 Å | (40) |
| 3.51 Å | (30) |
| 1.967 Å | (30) |
| 1.870 Å | (30) |
| 2.288 Å | (20) |
Reference:
Comments:
Mt. Koashva, Kola Peninsula, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Deloneite
General Appearance of Type Material:
Intimate intergrowths with belovite and another mineral. Grains 0.05-0.5 mm and rarely up to 1.0-1.5 mm in size.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Hyperagpaitic pegmatite.
Associated Minerals at Type Locality:
Synonyms of Deloneite
Other Language Names for Deloneite
Relationship of Deloneite to other Species
Member of:
Other Members of Belovite Group:
| Belovite-(Ce) | NaCeSr3(PO4)3F | Trig. 3 : P3 |
| Belovite-(La) | NaLaSr3(PO4)3F | Trig. 3 : P3 |
| Carlgieseckeite-(Nd) | NaNdCa3(PO4)3F | Trig. 3 : P3 |
| Fluorcaphite | SrCaCa3(PO4)3F | Hex. 6/m : P63/m |
| Fluorstrophite | SrCaSr3(PO4)3F | Hex. 6/m : P63/m |
| Kuannersuite-(Ce) | NaCeBa3(PO4)3F0.5Cl0.5 | Trig. 3 : P3 |
Common Associates
Associations Based on Photo Data:
| 1 photo of Deloneite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 1 photo of Deloneite associated with Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 8.BN. | Fluoralforsite | Ba5(PO4)3F |
| 8.BN. | Aradite | BaCa6[(SiO4)(VO4)](VO4)2F |
| 8.BN. | Magganasite | CuFe3+3O(AsO4)3 |
| 8.BN. | Fluorpyromorphite | Pb5(PO4)3F |
| 8.BN. | Fluorsigaiite | Ca2Sr3(PO4)3F |
| 8.BN.05 | Pieczkaite | Mn5(PO4)3Cl |
| 8.BN.05 | Fluorapatite | Ca5(PO4)3F |
| 8.BN.05 | Fluorcaphite | SrCaCa3(PO4)3F |
| 8.BN.05 | Vanadinite | Pb5(VO4)3Cl |
| 8.BN.05 | Hedyphane | Ca2Pb3(AsO4)3Cl |
| 8.BN.05 | Hydroxylhedyphane | Ca2Pb3(AsO4)3(OH) |
| 8.BN.05 | 'Mimetite-M' | Pb5(AsO4)3Cl |
| 8.BN.05 | Johnbaumite | Ca5(AsO4)3(OH) |
| 8.BN.05 | Pliniusite | Ca5(VO4)3F |
| 8.BN.05 | 'Hydroxylapatite-M' | Ca5(PO4)3OH |
| 8.BN.05 | Hydroxylpyromorphite | Pb5(PO4)3(OH) |
| 8.BN.05 | Miyahisaite | (Sr,Ca)2Ba3(PO4)3F |
| 8.BN.05 | Carlgieseckeite-(Nd) | NaNdCa3(PO4)3F |
| 8.BN.05 | Belovite-(Ce) | NaCeSr3(PO4)3F |
| 8.BN.05 | Kuannersuite-(Ce) | NaCeBa3(PO4)3F0.5Cl0.5 |
| 8.BN.05 | Alforsite | Ba5(PO4)3Cl |
| 8.BN.05 | 'Unnamed (OH-analogue of Mimetite)' | Pb5(AsO4)3(OH) |
| 8.BN.05 | Stronadelphite | Sr5(PO4)3F |
| 8.BN.05 | Parafiniukite | Ca2Mn3(PO4)3Cl |
| 8.BN.05 | Mimetite | Pb5(AsO4)3Cl |
| 8.BN.05 va | 'Germanate-pyromorphite' | Pb5(PO4)2GeO4 |
| 8.BN.05 | Belovite-(La) | NaLaSr3(PO4)3F |
| 8.BN.05 |
Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia