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Fluorapophyllite-(Cs)
A valid IMA mineral species
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About Fluorapophyllite-(Cs)
Formula:
CsCa4(Si8O20)F · 8H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.54
Crystal System:
Tetragonal
Member of:
Name:
The Cs equivalent of fluorapophyllite-(K).
Isostructural with:
This page provides mineralogical data about Fluorapophyllite-(Cs).
Unique Identifiers
Mindat ID:
53571
Long-form identifier:
mindat:1:1:53571:5
Similar Names
| Fluorapophyllite | A synonym | |
| Fluorapophyllite-(K) | A valid IMA mineral species - grandfathered | KCa4(Si8O20)(F,OH) · 8H2O |
| Fluorapophyllite-(K) - Hydroxyapophyllite-(K) Series | A solid-solution series between two end-member minerals | |
| Fluorapophyllite-(Na) | A valid IMA mineral species | NaCa4(Si8O20)F · 8H2O |
| Fluorapophyllite-(NH4) | A valid IMA mineral species - pending publication | NH4Ca4(Si8O20)F · 8H2O |
IMA Classification of Fluorapophyllite-(Cs)
Approved
IMA Formula:
CsCa4(Si8O20)F(H2O)8
Approval year:
2019
First published:
2019
Type description reference:
Agakhanov, Atali A., Pautov, Leonid A., Kasatkin, Anatoly V., Karpenko, Vladimir Yu., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Muftakhov, Vyacheslav A., Pekov, Igor V., CÃĄmara, Fernando, Britvin, Sergey N. (2019) Fluorapophyllite-(Cs), CsCa4(Si8O20)F(H2O)8, a new apophyllite-group mineral from the Darai-Pioz Massif, Tien-Shan, northern Tajikistan. The Canadian Mineralogist, 57 (6) 965-971 doi:10.3749/canmin.1900038
Classification of Fluorapophyllite-(Cs)
9.EA.07
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Fapo-Cs | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Fapo | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Fluorapophyllite-(Cs)
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN100=468 - 502 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Step-Like
Density:
2.54(2) g/cm3 (Measured) 2.513 g/cm3 (Calculated)
Optical Data of Fluorapophyllite-(Cs)
Type:
Uniaxial (+)
RI values:
nω = 1.540(2) nε = 1.544(2)
Max. Birefringence:
δ = 0.004
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 Âĩm 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 Âĩm 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:
None to Very Low
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.
Pleochroism:
Non-pleochroic
Chemistry of Fluorapophyllite-(Cs)
Mindat Formula:
CsCa4(Si8O20)F · 8H2O
Element Weights:
Crystallography of Fluorapophyllite-(Cs)
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mnc
Setting:
P4/mnc
Cell Parameters:
a = 9.060(6) Å, c = 15.741(11) Å
Ratio:
a:c = 1 : 1.737
Unit Cell V:
1,292.08 Ã
Âģ (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.870 Ã | (100) |
| 3.935 Ã | (100) |
| 3.602 Ã | (55) |
| 2.974 Ã | (84) |
| 2.515 Ã | (73) |
| 2.486 Ã | (71) |
| 2.119 Ã | (42) |
| 2.030 Ã | (45) |
Reference:
Agakhanov, Atali A., Pautov, Leonid A., Kasatkin, Anatoly V., Karpenko, Vladimir Yu., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Muftakhov, Vyacheslav A., Pekov, Igor V., CÃĄmara, Fernando, Britvin, Sergey N. (2019) Fluorapophyllite-(Cs), CsCa4(Si8O20)F(H2O)8, a new apophyllite-group mineral from the Darai-Pioz Massif, Tien-Shan, northern Tajikistan. The Canadian Mineralogist, 57 (6) 965-971 doi:10.3749/canmin.1900038
Comments:
From Type Description.
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 Fluorapophyllite-(Cs)
General Appearance of Type Material:
Grains, irregular in shape, up to 0.08 mm across and as zones in grains of fluorapophyllite-(K).
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5280/1
Associated Minerals at Type Locality:
Reference:
Agakhanov, Atali A., Pautov, Leonid A., Kasatkin, Anatoly V., Karpenko, Vladimir Yu., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Muftakhov, Vyacheslav A., Pekov, Igor V., CÃĄmara, Fernando, Britvin, Sergey N. (2019) Fluorapophyllite-(Cs), CsCa4(Si8O20)F(H2O)8, a new apophyllite-group mineral from the Darai-Pioz Massif, Tien-Shan, northern Tajikistan. The Canadian Mineralogist, 57 (6) 965-971 doi:10.3749/canmin.1900038
Synonyms of Fluorapophyllite-(Cs)
Other Language Names for Fluorapophyllite-(Cs)
Dutch:Fluorapophylliet-(Cs)
German:Fluorapophyllit-(Cs)
Relationship of Fluorapophyllite-(Cs) to other Species
Member of:
Other Members of Apophyllite Group:
| Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O | Tet. 4/mmm(4/m2/m2/m) : P4/mnc |
| Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O | Orth. |
| Fluorapophyllite-(NH4) | NH4Ca4(Si8O20)F · 8H2O | Tet. 4/mmm(4/m2/m2/m) : P4/mnc |
| Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O | Tet. 4/mmm(4/m2/m2/m) |
| Hydroxyapophyllite-(NH4) | (NH4)Ca4(Si8O20)(OH)(H2O)8 | Tet. 4/mmm(4/m2/m2/m) |
| Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O | Tet. |
Common Associates
Associations Based on Photo Data:
| 1 photo of Fluorapophyllite-(Cs) associated with Quartz | SiO2 |
| 1 photo of Fluorapophyllite-(Cs) associated with Stilbite-Na | Na9(Si27Al9)O72 · 28H2O |
| 1 photo of Fluorapophyllite-(Cs) associated with Pectolite | NaCa2Si3O8(OH) |
| 1 photo of Fluorapophyllite-(Cs) associated with Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA. | Miyawakiite-(Y) | âŧY4Fe2(Si8O20)(CO3)4(H2O)3 |
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Hydroxyapophyllite-(NH4) | (NH4)Ca4(Si8O20)(OH)(H2O)8 |
| 9.EA. | Fluorapophyllite-(NH4) | NH4Ca4(Si8O20)F · 8H2O |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.30 | Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Perettiite-(Y) | Y2Mn4FeSi2B8O24 |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Other Information
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 Fluorapophyllite-(Cs)
mindat.org URL:
https://www.mindat.org/min-53571.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Fluorapophyllite-(Cs)
Reference List:
Miyawaki, Ritsuro, Hatert, FrÃĐdÃĐric, Mills, Stuart J. (2019) New minerals and nomenclature modifications approved in 2019. CNMNC Newsletter 49. Mineralogical Magazine, 83 (3) 479-483 doi:10.1180/mgm.2019.35
Agakhanov, Atali A., Pautov, Leonid A., Kasatkin, Anatoly V., Karpenko, Vladimir Yu., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Muftakhov, Vyacheslav A., Pekov, Igor V., CÃĄmara, Fernando, Britvin, Sergey N. (2019) Fluorapophyllite-(Cs), CsCa4(Si8O20)F(H2O)8, a new apophyllite-group mineral from the Darai-Pioz Massif, Tien-Shan, northern Tajikistan. The Canadian Mineralogist, 57 (6) 965-971 doi:10.3749/canmin.1900038
Localities for Fluorapophyllite-(Cs)
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Tajikistan (TL) | |
| Miyawaki et al. (2019) +1 other reference |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan