Calcioandyrobertsite-1M Mineral Data

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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 % K₂O

Calcium 3.55 % Ca 4.96 % CaO

Copper 28.13 % Cu 35.21 % CuO

Arsenic 33.16 % As 50.87 % As₂O₅

Hydrogen 0.54 % H 4.78 % H₂O

Oxygen 31.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KCaCu₅(AsO₄)₄(As(OH)2O2)•2(H₂O)

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:

Click Here for Larger Calcioandyrobertsite-1M Image

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 - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 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:

PE_{Calcioandyrobertsite-1M}= 36.27 barns/electron
U=PE_{Calcioandyrobertsite-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:

Notes: