Cafarsite Mineral Data

Cafarsite Mineral Data
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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

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Cafarsite

Comments: Octahedron of cafarsite with a green coloration (?) on a gneiss matrix.
Location: Vasl D' Aosta, Italy. Scale: 4.6x4.5x3.2 cm.
© Isaias Casanova / IC Minerals
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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

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),
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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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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: