Calcio-andyrobertsite-2O Mineral Data

Calcio-andyrobertsite-2O Mineral Data

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General Calcio-andyrobertsite-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

Synonym:

IMA2000-011

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Calcio-andyrobertsite-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 - DipyramidalH-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),

Crystal Structure:

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Sarp H , Cerny R , European Journal of Mineralogy , 16 (2004) p.163-169, Calcio-andyrobertsite-2O, KCaCu5(AsO4)4[AsO2(OH)2]·2H2O: its, description, crystal structure and relation with calcio-andyrobertsite-1M, Locality: Tsumeb, Namibia

Physical Properties of Calcio-andyrobertsite-2O

Cleavage:

[100] Good

Color:

Intense blue.

Density:

3.9

Diaphaniety:

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 Calcio-andyrobertsite-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

Optical Data:

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

Calculated Properties of Calcio-andyrobertsite-2O

Electron Density:

r_electron=3.57 gm/cc
note: r_{Calcio-andyrobertsite-2O}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

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

Radioactivity:

GRapi = 46.97 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Calcio-andyrobertsite-2O - barely detectable

Calcio-andyrobertsite-2O Classification

Dana Class:

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

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.2)Dana Group

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

42.9.2.2 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

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

42.9.2.4 Calcio-andyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

42.9.2.5 Calcio-andyrobertsite-2O ! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P nma 2/m 2/m 2/m

Strunz Class:

VII/D.25-36* VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.25 - Lavendulan series

VII/D.25-10 Sampleite NaCaCu5(PO4)4Cl·5(H2O) pseudo TET 2/m 2/m 2/m

VII/D.25-20 Lavendulan NaCaCu5(AsO4)4Cl·5(H2O) Unk Ortho

VII/D.25-22 Zinclavendulan* NaCa(Zn,Cu)5(AsO4)4Cl·4-5(H2O) Unk Ortho

VII/D.25-24 Lemanskiite! NaCaCu5(AsO4)4Cl·5(H2O) P 4₁22 or P 4₃22 Tetra

VII/D.25-25 Zdenekite NaPbCu5(AsO4)4Cl·5(H2O) P 4₁22,P 4₃22 4 2 2

VII/D.25-27 Mahnertite! (Na,Ca)Cu3(AsO4)2Cl·5(H2O) I 4mmm 4 2 2

VII/D.25-30 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)·7(H2O)(?) Unk Ortho

VII/D.25-33 Goldquarryite! (Cu,[])(Cd,Ca)2Al3(PO4)4F2(H2O)10{(H2O,F)}2 P1 1

VII/D.25-35 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36 Calcio-andyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

VII/D.25-36* Calcio-andyrobertsite-2O KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P nma 2/m 2/m 2/m

VII/D.25-38 Esperanzaite! NaCa2Al2(AsO4)2F4(OH)·2(H2O) P 2₁/m 2/m

VII/D.25-40 Englishite K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) A2 or Aa 2

Other Calcio-andyrobertsite-2O Information

References:

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

See Also:

Links to other databases for Calcio-andyrobertsite-2O :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Calcio-andyrobertsite-2O Specimen Label here :

Calcio-andyrobertsite-2O

KCaCu5(AsO4)4[As(OH)2O2]·2(H2O)
Dana No: 42.9.2.5 Strunz No: VII/D.25-36*
Locality:

Notes: