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 % K2 O
Calcium 3.55 % Ca 4.96 % CaO
Copper 28.13 % Cu 31.67 % Cu2 O
Arsenic 33.16 % As 50.87 % As2 O5
Hydrogen 0.54 % H 4.78 % H2 O
Oxygen 31.16 % O
______ ______
100.00 % 96.46 % = TOTAL OXIDE
Empirical Formula:
KCaCu5 (AsO4 )4 (OH)2 AsO2 •2(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PECalcioandyrobertsite-2O = 36.27 barns/electronU=PECalcioandyrobertsite-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 � 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:
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