Calcioandyrobertsite-1M Mineral Data
General Calcioandyrobertsite-1M 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 35.21 % CuO
Arsenic 33.16 % As 50.87 % As2 O5
Hydrogen 0.54 % H 4.78 % H2 O
Oxygen 31.16 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
KCaCu5 (AsO4 )4 (As(OH)2O2)•2(H2 O)
Environment:
Single specimen found at the mine. Forms a series with andyrobertsite.
IMA Status:
Approved IMA 1999 (Dana # Added)
Locality:
Tsumeb Mine, Tsumeb, Namibia. Link to MinDat.org Location Data.
Name Origin:
Named after Andrew C. Roberts (1950-), mineralogist with the Geological Survey of Canada.
Name Pronunciation:
Calcioandyrobertsite-1M + Pronunciation
Synonym:
Calcio-andyrobertsite-1M - Renamed Calcioandyrobertsite-1M by Mineralogical Record, v39 (2008), p131
IMA1997-022
Calcioandyrobertsite-1M Image
Images:
Calcioandyrobertsite-1M Tennantite
Comments: Vein of blue calcioandyrobertsite in massive dark gray tennantite. The vein of calcioandyrobertsite extends for 0.8cm.
Location: Tsumeb Mine, Tsumeb, Namibia.
Scale: Specimen size 1.1 x 0.5 cm.
© John Veevaert
Calcioandyrobertsite-1M Crystallography
Axial Ratios:
a:b:c =0.9776:1:0.9941
Cell Dimensions:
a = 9.81, b = 10.034, c = 9.975, Z = 2; beta = 101.84° V = 960.98 Den(Calc)= 3.90
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /m
X Ray Diffraction:
By Intensity(I/Io ): 9.64(1), 3.145(0.5), 4.46(0.4),
Physical Properties of Calcioandyrobertsite-1M
Cleavage:
{100} Good
Color:
Electric blue.
Density:
4.011
Diaphaneity:
Transparent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
3 - Calcite
Luster:
Vitreous (Glassy)
Streak:
pale blue
Optical Properties of Calcioandyrobertsite-1M
Gladstone-Dale:
CI meas = -0.035 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = -0.064 (Fair) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1885,KPDmeas = 0.1832,KC = 0.1771 Ncalc = 1.69 - 1.71
Optical Data:
Biaxial (-), a=1.713, b=1.743, g=1.749, bire=0.0360
Calculated Properties of Calcioandyrobertsite-1M
Electron Density:
Bulk Density (Electron Density)=3.77 gm/cc note: Specific Gravity of Calcioandyrobertsite-1M =4.01 gm/cc.
Fermion Index:
Fermion Index = 0.000202433 Boson Index = 0.999797567
Photoelectric:
PECalcioandyrobertsite-1M = 36.27 barns/electronU=PECalcioandyrobertsite-1M x r electron = 136.77 barns/cc.
Radioactivity:
GRapi = 46.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Calcioandyrobertsite-1M per GRapi unit = 2.13 (%)
Estimated Radioactivity from Calcioandyrobertsite-1M - barely detectable
Calcioandyrobertsite-1M Classification
Dana Class:
42.09.02.04 (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-1M Information
References:
NAME( AmMin, Vol 84) PHYS. PROP.(AmMin) OPTIC PROP.(AmMin)
See Also:
Links to other databases for Calcioandyrobertsite-1M :
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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Print or Cut-and-Paste your Calcioandyrobertsite-1M Specimen Label here :
Calcioandyrobertsite-1M
KCaCu5(AsO4)4[As(OH)2O2]•2(H2O)
Dana No: 42.09.02.04 Strunz No: 08.DH.50
Locality:
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