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Fluorapophyllite-(Cs)

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


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Unique IdentifiersHide

Mindat ID:
53571
Long-form identifier:
mindat:1:1:53571:5
GUID
(UUID V4):
032edad8-ecf6-483c-af64-c3e489a5f822

IMA Classification of Fluorapophyllite-(Cs)Hide

Classification of Fluorapophyllite-(Cs)Hide

Strunz-mindat (2023):
9.EA.07

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
Fapo-CsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
FapoThe 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)Hide

Lustre:
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)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

Chemistry of Fluorapophyllite-(Cs)Hide

Mindat Formula:
CsCa4(Si8O20)F · 8H2O
Elements listed:
Ca, Cs, F, H, O, Si - search for minerals with similar chemistry

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

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of Fluorapophyllite-(Cs)Hide

Type Locality:
ⓘ Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
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:
QuartzPyrochlore GroupPectoliteNeptuniteLeucosphenite
Fluorapophyllite-(K)BaratoviteAegirine
Reference:
Agakhanov, A.A., Pautov, L.A., Kasatkin, A.V., Karpenko, V.Yu., Sokolova, E., Day, M.C., Hawthorne, F.C., Muftakhov, V.A., Pekov, I.V., Cámara, F., Britvin, S.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.

Synonyms of Fluorapophyllite-(Cs)Hide

Other Language Names for Fluorapophyllite-(Cs)Hide

Relationship of Fluorapophyllite-(Cs) to other SpeciesHide

Member of:
Apophyllite Group
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. 4/mmm (4/m 2/m 2/m)
Hydroxymcglassonite-(K)KSr4Si8O20(OH) · 8H2OTet.

Related Minerals - Strunz-mindat GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
9.EA.Fluorapophyllite-(NH₄)NH4Ca4(Si8O20)F · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.Hydroxymcglassonite-(K)KSr4Si8O20(OH) · 8H2OTet.
9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05GillespiteBaFe2+Si4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05WesselsiteSrCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet. 4/mmm (4/m 2/m 2/m)
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OOrth. mm2 : Fdd2
9.EA.25DalyiteK2ZrSi6O15Tric. 1 : P1
9.EA.25DavaniteK2TiSi6O15Tric.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14 · 6H2OOrth. mm2 : Pmm2
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon. 2/m : B2/m
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15 · 7H2OTric. 1 : P1
9.EA.45Perettiite-(Y)Y2Mn4FeSi2B8O24Orth. mmm (2/m 2/m 2/m) : Pmna
9.EA.45Badakhshanite-(Y)Y2Mn4Al(Si2B7BeO24)Orth. mmm (2/m 2/m 2/m) : Pnma
9.EA.47ShlykoviteKCa[Si4O9(OH)] · 3H2OMon. 2/m : P21/b
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.50DiegogattaiteNa2CaCu2Si8O20 · H2OMon. 2/m : B2/m
9.EA.52YangitePbMnSi3O8 · H2OTric. 1 : P1
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon. 2/m : P21/b
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

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.

Internet Links for Fluorapophyllite-(Cs)Hide

References 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 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). 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 (e.g. 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.
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