Cobaltaustinite Mineral Data

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General Cobaltaustinite Information

Chemical Formula:

CaCo(AsO4)(OH)

Composition:

Molecular Weight = 254.94 gm

Calcium 15.72 % Ca 22.00 % CaO

Cobalt 23.12 % Co 29.39 % CoO

Arsenic 29.39 % As 45.08 % As₂O₅

Hydrogen 0.40 % H 3.53 % H₂O

Oxygen 31.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCo(AsO₄)(OH)

Environment:

Rare secondary mineral in the oxidized zone of a copper deposit, an alteration product of arsenides.

IMA Status:

Approved IMA 1988

Locality:

Dome Rock copper mine, about 40 km northwest of Mingary, South Australia. Link to MinDat.org Location Data.

Name Origin:

Named for its content of cobalt and similarity to austinite.

Cobaltaustinite Image

Images:

Cobaltaustinite

Comments: Green, tabular crystal of cobaltaustinite.
Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Cobaltaustinite Crystallography

Axial Ratios:

a:b:c =0.8324:1:0.768

Cell Dimensions:

a = 7.5, b = 9.01, c = 6.92, Z = 4; V = 467.62 Den(Calc)= 3.62

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.609(1), 3.159(1), 2.633(0.8),

Crystal Structure:

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Yang H , Costin G , Keogh J , Lu R , Downs R T , Acta Crystallographica, Section E , 63 (2007) p.i53-i55, Cobaltaustinite, CaCo(AsO4)(OH), Locality: Dome Rock, Mingary, South Australia, Australia

Physical Properties of Cobaltaustinite

Cleavage:

None

Color:

Green.

Diaphaneity:

Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Earthy (Dull)

Streak:

light green

Optical Properties of Cobaltaustinite

Gladstone-Dale:

CI calc= -0.186 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2181,KC= 0.1838
Ncalc = 1.67

Optical Data:

Biaxial (+), a=1.777, g=1.802, bire=0.0250

Calculated Properties of Cobaltaustinite

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Cobaltaustinite =3.62 gm/cc.

Fermion Index:

Fermion Index = 0.0003634419
Boson Index = 0.9996365581

Photoelectric:

PE_{Cobaltaustinite}= 30.04 barns/electron
U=PE_{Cobaltaustinite} x rElectron Density= 103.23 barns/cc.

Radioactivity:

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

Cobaltaustinite Classification

Dana Class:

41.05.01.08 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.01)Adelite Group

41.05.01.01 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.02 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.03 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.04 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.05 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.05.01.06 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.07 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.08 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.09 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

08.BH.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.35 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

08.BH.35 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Cobaltaustinite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.74,p501,1989) OPTIC PROP.(Am.Min.,Vol.74,p501,1989)

See Also:

Links to other databases for Cobaltaustinite :
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

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Cobaltaustinite

CaCo(AsO4)(OH)
Dana No: 41.05.01.08 Strunz No: 08.BH.35
Locality:

Notes: