Fluorstrophite
A valid IMA mineral species
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About Fluorstrophite
Formula:
SrCaSr3(PO4)3F
Colour:
Green to yellow-green, colourless
Lustre:
Vitreous, Greasy
Hardness:
5
Crystal System:
Hexagonal
Member of:
Name:
First named strontium-apatite by Efimov et al. in 1962. It was later changed to apatite-(SrOH) (Burke 2008) despite fluorine being dominant over hydroxyl. It was renamed to fluorstrophite by Pasero et al. (2010). The current name reflects the composition, including dominant fluorine, strontium, and phosphate.
This page provides mineralogical data about Fluorstrophite.
Unique Identifiers
Mindat ID:
3757
Long-form identifier:
mindat:1:1:3757:6
IMA Classification of Fluorstrophite
Approved
Approval year:
1962
First published:
1962
Classification of Fluorstrophite
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
41.8.1.7
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.1.18
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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 |
|---|---|---|
| Fstr | 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 Fluorstrophite
Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Green to yellow-green, colourless
Hardness:
5 on Mohs scale
Optical Data of Fluorstrophite
Type:
Uniaxial (-)
RI values:
nω = 1.651 nε = 1.637
Max. Birefringence:
δ = 0.014
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:
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 Fluorstrophite
Mindat Formula:
SrCaSr3(PO4)3F
Element Weights:
Crystallography of Fluorstrophite
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 9.565(8) Å, c = 7.115(3) Å
Ratio:
a:c = 1 : 0.744
Unit Cell V:
563.74 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals short to long hexagonal prisms [0001], with {1010} and {1011} dominant; also thick tabular {0001}, frequently in the crystals of hydrothermal origin in pegmatites and veins, with {1010}, relatively large {0001}, and often also {1011} or low pyramids. Massive, coarse granular to compact.
Comment:
Space group P63/m or P63.
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) |
|---|---|---|---|---|---|---|---|
| 0014055 | Fluorstrophite | Klevtsova R F (1964) The crystal structure of strontium-apatite Journal of Structural Chemistry 5 318-320 | 1964 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.89 Å | (100) |
| 3.167 Å | (70) |
| 2.78 Å | (70) |
| 1.909 Å | (70) |
| 1.467 Å | (60) |
| 2.32 Å | (50) |
| 2.147 Å | (50) |
| 1.953 Å | (40) |
| 1.849 Å | (40) |
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 Fluorstrophite
General Appearance of Type Material:
Poorly formed oval crystals 0.2x1 cm in longitudinal section and as small crystals with corroded faces.
Geological Setting of Type Material:
Alkalic pegmatites
Associated Minerals at Type Locality:
Synonyms of Fluorstrophite
Other Language Names for Fluorstrophite
Dutch:Fluorstrophiet
German:Fluorstrophit
Strontiapatit
Strontiapatit
Japanese:ストロンチウム燐灰石
Russian:Стронциоапатит
Апатит-(SrOH)
Апатит-(SrOH)
Spanish:Strontiapatita
Relationship of Fluorstrophite 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 |
| Deloneite | (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 | Trig. 3 : P3 |
| Fluorcaphite | SrCaCa3(PO4)3F | Hex. 6/m : P63/m |
| Kuannersuite-(Ce) | NaCeBa3(PO4)3F0.5Cl0.5 | Trig. 3 : P3 |
Common Associates
Associations Based on Photo Data:
| 3 photos of Fluorstrophite associated with Magnesio-arfvedsonite | NaNa2(Mg4Fe3+)(Si8O22)(OH)2 |
| 2 photos of Fluorstrophite associated with Orthoclase | K(AlSi3O8) |
| 1 photo of Fluorstrophite associated with Siderite | FeCO3 |
| 1 photo of Fluorstrophite associated with Marcasite | FeS2 |
| 1 photo of Fluorstrophite associated with Titanite | CaTiO(SiO4) |
| 1 photo of Fluorstrophite associated with 'Strontium-bearing Thomsonite' | Na(Ca,Sr)2[Al5Si5O20] · 6H2O |
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 | Fluorphosphohedyphane | Ca2Pb3(PO4)3F |
| 8.BN.05 | Hydroxylapatite | Ca5(PO4)3(OH) |
| 8.BN.05 | 'Johnbaumite-M' | Ca5(AsO4)3OH |
| 8.BN.05 | Phosphohedyphane | Ca2Pb3(PO4)3Cl |
| 8.BN.05 | Turneaureite | Ca5(AsO4)3Cl |
| 8.BN.05 | Morelandite | Ca2Ba3(AsO4)3Cl |
| 8.BN.05 | 'Oxypyromorphite' | Pb10(PO4)6O |
| 8.BN.05 | Deloneite | (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 |
| 8.BN.05 | Chlorapatite | Ca5(PO4)3Cl |
| 8.BN.05 | Pyromorphite | Pb5(PO4)3Cl |
| 8.BN.05 | Vanackerite | Pb4Cd(AsO4)3Cl |
| 8.BN.05 | Svabite | Ca5(AsO4)3F |
| 8.BN.10 | Arctite | Na2Ca4(PO4)3F |
| 8.BN.10 | Krügerite | BaCa6(SiO4)2[(P0.5S0.5)O4]2F |
| 8.BN.15 | Goryainovite | Ca2(PO4)Cl |
Other Information
Notes:
Soluble in HCl or in HNO3. Varieties containing CO3 may dissolve with slight effervescence.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Fluorstrophite
mindat.org URL:
https://www.mindat.org/min-3757.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fluorstrophite
Reference List:
Volkova and Melentiev (1939) Comptes rendus de l’académie des sciences de l’U.R.S.S., n.s.: 25: 120.
Fleischer, Michael; Foster, Margaret D. (1962) New mineral names. American Mineralogist, 47 (5-6). 805-812
Klevtsova, R. F. (1965) The crystal structure of strontium-apatite. Journal of Structural Chemistry, 5 (2). 292-294 doi:10.1007/bf00761528
Sudarsanan, K., Young, R. A. (1972) Structure of strontium hydroxide phosphate, Sr5(PO4)3OH. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 28 (12) 3668-3670 doi:10.1107/s0567740872008544
Chakhmouradian, A. R., Reguir, E. P., Mitchell, R. H. (2002) Strontium-apatite: New occurrences, and the extent of Sr-for-Ca substitution in apatite-group minerals. The Canadian Mineralogist, 40 (1) 121-136 doi:10.2113/gscanmin.40.1.121
Localities for Fluorstrophite
Showing 13 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Bottrill (2021) |
Canada | |
| Anton R. Chakhmouradian and Roger H. Mitchell (2001) |
| Platt & Wooley (1990) |
Japan | |
| Mandarino (2002) |
| Sakai & Akai (1988) | |
Mexico | |
| Alejandro Felix Collection |
Russia | |
| Canadian Mineralogist 40:121-136 |
| Osipov et al. (2021) |
| ... |
| Pekov (1998) |
South Africa | |
| Mitchell et al. (2004) |
USA | |
| Cooper et al. (2003) |
Zambia | |
|
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Inagli chrome-diopside deposit, Inagli Massif, Aldan, Sakha, Russia