Cafarsite Mineral Data (original) (raw)

General Cafarsite Information

Help on Chemical Formula: Chemical Formula:

Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12•4(H2O)

Help on Composition: Composition:

Molecular Weight = 2,230.31 gm

Calcium 14.38 % Ca 20.11 % CaO

Titanium 7.51 % Ti 12.54 % TiO2

Manganese 1.23 % Mn 1.59 % MnO

Iron 7.51 % Fe 6.44 % FeO / 3.58 % Fe2O3

Arsenic 40.31 % As 53.22 % As2O3

Hydrogen 0.36 % H 3.23 % H2O

Oxygen 28.69 % O

______ ______

100.00 % 100.72 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ca8Ti3.5Fe2+2Fe3+Mn2+0.5(AsO3)12•4(H2O)

Help on Environment: Environment:

On cleft faces in orthogneiss.

Help on IMA Status: IMA Status:

Approved IMA 1966

Help on Locality: Locality:

West flank of Cherbadung [Pizzo Cervandone], Binntal, Valais, Switzerland. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the elements in the composition, CAlcium, iron (Ferrum), and ARSenic.

Help on Name Pronunciation: Name Pronunciation:

Cafarsite + Pronunciation Say CAFARSITE

Help on Synonym: Synonym:

ICSD 200144

PDF 19-197

Cafarsite Image

Click Here for Larger Cafarsite Image in a New Browser Window Images:

Click Here for Larger Cafarsite Image in a New Browser Window Images:

Click Here for Larger Cafarsite Image Cafarsite Comments: Small, cubic crystal of cafarsite on matrix. Location: Wannigletscher, Binntal, Switzerland.Scale: Crystal size 0.5 cm. © Rob Lavinsky

Cafarsite Crystallography

Help on Cell Dimensions: Cell Dimensions:

a = 16.01, Z = 4; V = 4,103.69 Den(Calc)= 3.61

Help on Crystal System: Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P n3

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.83(1), 2.75(0.8), 3.15(0.7),

Click Here for Large Cafarsite Structure Window Crystal Structure:

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Help on Above

| | Edenharter A , Nowacki W , Weibel M , Schweizerische Mineralogische und Petrographische Mitteilungen , 57 (1977) p.1-16, Zur struktur und zusammensetzung von cafarsit, cafarsit ein As(III)-oxid,, kein arsenat, Locality: synthetic, Note: Water positions were not determined | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Cafarsite

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brownish yellow, Brownish black, Dark brown, Dark red.

Help on Density: Density:

3.9

Help on Diaphaneity: Diaphaneity:

Translucent to Opaque

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Hardness: Hardness:

5.5-6 - Knife Blade-Orthoclase

Help on Luster: Luster:

Sub Metallic

Help on Streak: Streak:

yellowish brown

Optical Properties of Cafarsite

Help on Optical Data: 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

Calculated Properties of Cafarsite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Cafarsite =3.61 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PECafarsite = 33.41 barns/electron
U=PECafarsite x rElectron Density= 113.73 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cafarsite is Not Radioactive

Cafarsite Classification

Help on Dana Class: Dana Class:

45.01.04.01 (45)Acid and normal Antimonites, Arsenites and Phosphites

(45.01)with miscellaneous formulae

(45.01.04)Dana Group

45.01.04.01 Cafarsite Ca8(Ti,Fe,Fe,Mn)6-7(AsO3)12•4(H2O) P n3 2/m 3

Help on Strunz Class: Strunz Class:

04.JC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JC -Arsenites, antimonites, bismuthites; without additional anions, with H2O

04.JC.05 Cafarsite Ca8(Ti,Fe,Fe,Mn)6-7(AsO3)12•4(H2O) P n3 2/m 3

Other Cafarsite Information

Help on References: References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: 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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Ask about Cafarsite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Cafarsite Specimen Label here :

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: