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Fluorapophyllite-(Cs)

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Formula:
CsCa4(Si8O20)F(H2O)8
Colour:
colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.54
Crystal System:
Tetragonal
Name:
The Cs equivalent of fluorapophyllite-(K).
Isostructural with:
This page provides mineralogical data about Fluorapophyllite-(Cs).


Hide all sections | Show all sections

Classification of Fluorapophyllite-(Cs)Hide

Approved
Approval Year:
2019

Physical Properties of Fluorapophyllite-(Cs)Hide

Vitreous
Transparency:
Transparent
Colour:
colorless
Streak:
white
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Step-Like
Density:
2.54(2) g/cm3 (Measured)    2.513 g/cm3 (Calculated)

Optical Data of Fluorapophyllite-(Cs)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.540(2) nε = 1.544(2)
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of Fluorapophyllite-(Cs)Hide

Formula:
CsCa4(Si8O20)F(H2O)8

Crystallography of Fluorapophyllite-(Cs)Hide

Crystal System:
Tetragonal
Cell Parameters:
a = 9.060(6) Å, c = 15.741(11) Å
Ratio:
a:c = 1 : 1.737
Unit Cell V:
1,292.08 ų (Calculated from Unit Cell)
Z:
2
Comment:
P4/nmc

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.870 Å(100)
3.935 Å(100)
3.602 Å(55)
2.974 Å(84)
2.515 Å(73)
2.486 Å(71)
2.119 Å(42)
2.030 Å(45)
Comments:
From Type Description.

Geological EnvironmentHide

Type Occurrence of Fluorapophyllite-(Cs)Hide

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., Leonid A. Pautov, Anatoly V. Kasatkin, Vladimir Yu Karpenko, Elena Sokolova, Maxwell C. Day, Frank C. Hawthorne et al. "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, no. 6 (2019): 965-971.

Synonyms of Fluorapophyllite-(Cs)Hide

Other Language Names for Fluorapophyllite-(Cs)Hide

Relationship of Fluorapophyllite-(Cs) to other SpeciesHide

Other Members of this group:
Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
Fluorapophyllite-(NH₄)NH4Ca4(Si8O20)F · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fluorapophyllite-(Cs)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Kasatkin, A.V., Sokolova, E., Day, M.C., Hawthorne, F.C., Karpenko, V.Y., Muftakhov, V.A., Pekov, I.V., Cámara Artigas, F. and Britvin, S.N. (2019) Fluorapophyllite-(Cs), IMA 2018-108a. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83: 323–328.
Agakhanov, Atali A., Leonid A. Pautov, Anatoly V. Kasatkin, Vladimir Yu Karpenko, Elena Sokolova, Maxwell C. Day, Frank C. Hawthorne et al. "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, no. 6 (2019): 965-971.

Internet Links for Fluorapophyllite-(Cs)Hide

Localities for Fluorapophyllite-(Cs)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tajikistan (TL)
 
  • Districts of Republican Subordination
Agakhanov, A.A., Pautov, L.A., Kasatkin, A.V., Sokolova, E., Day, M.C., Hawthorne, F.C., Karpenko, V.Y., Muftakhov, V.A., Pekov, I.V., Cámara Artigas, F. and Britvin, S.N. (2019) Fluorapophyllite-(Cs), IMA 2018-108a. CNMNC Newsletter No. 49, June 2019, page xxx. Mineralogical Magazine, 83: 323–328.
 
Mineral and/or Locality  
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