Calcioandyrobertsite-2O Mineral Data

General Calcioandyrobertsite-2O Information

Chemical Formula:

KCaCu5(AsO4)4[As(OH)2O2]•2(H2O)

Composition:

Molecular Weight = 1,129.55 gm

Potassium 3.46 % K 4.17 % K₂O

Calcium 3.55 % Ca 4.96 % CaO

Copper 28.13 % Cu 31.67 % Cu₂O

Arsenic 33.16 % As 50.87 % As₂O₅

Hydrogen 0.54 % H 4.78 % H₂O

Oxygen 31.16 % O

______ ______

100.00 % 96.46 % = TOTAL OXIDE

Empirical Formula:

KCaCu₅(AsO₄)₄(OH)₂AsO₂•2(H₂O)

Environment:

Occurs in a specimen of quartz gangue. Polymorph of calcioandyrobertsite; structure.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Tsumeb mine, Namibia Link to MinDat.org Location Data.

Name Origin:

Named as the -2O polytype of calcio-andyrobertsite-1M

Name Pronunciation:

Calcioandyrobertsite-2O + Pronunciation

Synonym:

Calcio-andyrobertsite-2O - Renamed Calcioandyrobertsite-2O by Mineralogical Record, v39 (2008), p131

IMA2000-011

Calcioandyrobertsite-2O Crystallography

Axial Ratios:

a:b:c =1.9477:1:0.9877

Cell Dimensions:

a = 19.647, b = 10.087, c = 9.963, Z = 4; V = 1,974.46 Den(Calc)= 3.80

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.116(1)(322,610), 2.76(0.9)(132), 4.487(0.9)(220),4.83(0.7)(102), 7.084(0.7)(011), 3.965(0.6)(302), 6.665(0.6)(111), 9.8(0.5)(200), 1.758(0.4)(840,11.0.1),

Physical Properties of Calcioandyrobertsite-2O

Cleavage:

{100} Good

Color:

Intense blue.

Density:

3.9

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Calcioandyrobertsite-2O

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1912,KPDmeas= 0.1863,KC= 0.1914
Ncalc = 1.73 - 1.75

Optical Data:

Biaxial (-), a=1.715, b=1.73, g=1.735, bire=0.0200

Calculated Properties of Calcioandyrobertsite-2O

Electron Density:

Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Calcioandyrobertsite-2O =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.000202433
Boson Index = 0.999797567

Photoelectric:

PE_{Calcioandyrobertsite-2O}= 36.27 barns/electron
U=PE_{Calcioandyrobertsite-2O} x r_electron= 129.57 barns/cc.

Radioactivity:

GRapi = 46.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Calcioandyrobertsite-2O per GRapi unit = 2.13 (%)

Estimated Radioactivity from Calcioandyrobertsite-2O - barely detectable

Calcioandyrobertsite-2O Classification

Dana Class:

42.09.02.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.09)where (A)3 (XO4)2 Zq ï¿½ x(H2O)

(42.09.02)Souzalite Group

42.09.02.01 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6•2(H2O) P1,P 1 Tri

42.09.02.02 Gormanite Fe3Al4(PO4)4(OH)6•2(H2O) P1,P 1 Tri

42.09.02.03 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

42.09.02.04 Calcioandyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

42.09.02.05 Calcioandyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P nma 2/m 2/m 2/m

Strunz Class:

08.DH.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

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

08.DH.50 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

08.DH.50 Calcioandyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

08.DH.50 Calcioandyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P nma 2/m 2/m 2/m

Other Calcioandyrobertsite-2O Information

References:

NAME( EurJMin, 16:163) PHYS. PROP.(EurJMin, 16:163) OPTIC PROP.(EurJMin, 16:163)

See Also:

Links to other databases for Calcioandyrobertsite-2O :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Calcioandyrobertsite-2O

KCaCu5(AsO4)4[As(OH)2O2]•2(H2O)
Dana No: 42.09.02.05 Strunz No: 08.DH.50
Locality:

Notes:

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