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Cafarsite Mineral Data
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General Cafarsite Information
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 Chemical Formula: |
Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12•4(H2O) |
| Composition: |
Molecular Weight = 2,230.31 gm |
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Calcium 14.38 % Ca 20.11 % CaO |
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Titanium 7.51 % Ti 12.54 % TiO2 |
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Manganese 1.23 % Mn 1.59 % MnO |
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Iron 7.51 % Fe 6.44 % FeO / 3.58 % Fe2O3 |
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Arsenic 40.31 % As 53.22 % As2O3 |
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Hydrogen 0.36 % H 3.23 % H2O |
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Oxygen 28.69 % O |
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______ ______ |
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100.00 % 100.72 % = TOTAL OXIDE |
| Empirical Formula: |
Ca8Ti3.5Fe2+2Fe3+Mn2+0.5(AsO3)12•4(H2O) |
| Environment: |
On cleft faces in orthogneiss. |
| IMA Status: |
Approved IMA 1966 |
| Locality: |
West flank of Cherbadung [Pizzo Cervandone], Binntal, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the elements in the composition, CAlcium, iron (Ferrum), and ARSenic. |
| Name Pronunciation: |
Cafarsite + Pronunciation  |
| Synonym: |
ICSD 200144 |
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PDF 19-197 |
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Cafarsite Image |
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Images:
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Images:
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Cafarsite
Comments: Small, cubic crystal of cafarsite on matrix.
Location: Wannigletscher, Binntal, Switzerland.
Scale: Crystal size 0.5 cm.
© Rob Lavinsky |
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Cafarsite Crystallography
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| Cell Dimensions: |
a = 16.01, Z = 4; V = 4,103.69 Den(Calc)= 3.61 |
| Crystal System: |
Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P n3 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.83(1), 2.75(0.8), 3.15(0.7), |
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Physical Properties of Cafarsite
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| Cleavage: |
None |
| Color: |
Brownish yellow, Brownish black, Dark brown, Dark red. |
| Density: |
3.9 |
| Diaphaneity: |
Translucent to Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
5.5-6 - Knife Blade-Orthoclase |
| Luster: |
Sub Metallic |
| Streak: |
yellowish brown |
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Optical Properties of Cafarsite
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| Optical Data: |
NCalc= 1.92 - from Gladstone-Dale relationship (KC = 0.2541) where Ncalc=Dcalc*KC+1
NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2541) where Ncalc=Dmeas*KC+1
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Calculated Properties of Cafarsite
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| Electron Density: |
Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Cafarsite =3.61 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PECafarsite = 33.41 barns/electron
U=PECafarsite x rElectron Density= 113.73 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cafarsite is Not Radioactive |
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Cafarsite Classification
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| Dana Class: |
45.01.04.01 (45)Acid and normal Antimonites, Arsenites and Phosphites |
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(45.01)with miscellaneous formulae |
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(45.01.04)Dana Group |
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45.01.04.01 Cafarsite Ca8(Ti,Fe,Fe,Mn)6-7(AsO3)12•4(H2O) P n3 2/m 3 |
| Strunz Class: |
04.JC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.J - Arsenites, Antimonites, Bismuthites, Sulfites, |
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04.JC -Arsenites, antimonites, bismuthites; without additional anions, with H2O |
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04.JC.05 Cafarsite Ca8(Ti,Fe,Fe,Mn)6-7(AsO3)12•4(H2O) P n3 2/m 3 |
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Other Cafarsite Information
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Cafarsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Cafarsite Specimen Label here :
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Cafarsite
Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12•4(H2O)
Dana No: 45.01.04.01 Strunz No: 04.JC.05
Locality:
Notes:
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