Cobaltaustinite Mineral Data

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)

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

Cobaltaustinite Image

Images:

Cobaltaustinite

Comments: Green, tabular crystal of cobaltaustinite.
Location: Rappold Mine, Neust?dtel, 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),

Physical Properties of Cobaltaustinite

Cleavage:

None

Color:

Green.

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Cobaltaustinite

Electron Density:

r_electron=3.44 gm/cc
note: r_{Cobaltaustinite}=3.62 gm/cc.

Fermion Index

Fermion Index = 0.00036
Boson Index = 0.99964

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cobaltaustinite is Not Radioactive

Cobaltaustinite Classification

Dana Class:

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

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

(41.5.1)Dana Group

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

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

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

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

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

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

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

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

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

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

Strunz Class:

VII/B.26-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Cobaltaustinite Information

References:

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Cobaltaustinite

CaCo(AsO4)(OH)
Dana No: 41.5.1.8 Strunz No: VII/B.26-30
Locality:

Notes: