Shubnikovite Mineral Data

Shubnikovite Mineral Data +

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General Shubnikovite Information

Chemical Formula:

Ca2Cu8(AsO4)6Cl(OH)·7(H2O) (?)

Composition:

Molecular Weight = 1,600.61 gm

Calcium 5.01 % Ca 7.01 % CaO

Copper 31.76 % Cu 39.76 % CuO

Arsenic 28.08 % As 43.08 % As₂O₅

Hydrogen 0.94 % H 8.44 % H₂O

Chlorine 2.21 % Cl 2.21 % Cl

- % Cl -0.50 % -O=Cl₂

Oxygen 31.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Cu₈(AsO₄)₆Cl(OH)·7(H₂O)

Environment:

Inadequately described mineral. Found in a Russian oxidation zone.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for Aleksei V. Shunikov (1887-1971), crystallographer, Institute of Crystallography, Moscow, Russia.

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Shubnikovite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Shubnikovite

Color:

Light blue.

Habit:

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

Hardness:

2 - Gypsum

Optical Properties of Shubnikovite

Optical Data:

Biaxial (-), a=1.64, b=1.69, g=1.69, bire=0.0500, 2V(Calc)=0, 2V(Meas)=small.

Pleochroism (x):

light blue.

Pleochroism (y):

greenish blue.

Pleochroism (z):

greenish blue.

Calculated Properties of Shubnikovite

Fermion Index

Fermion Index = 0.00022
Boson Index = 0.99978

Photoelectric:

PE_Shubnikovite= 34.14 barns/electron
U=PE_Shubnikovite x r_electron= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Shubnikovite is Not Radioactive

Shubnikovite Classification

Dana Class:

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

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.8)Dana Group

42.8.8.1 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)·7(H2O)(?) Unk Ortho

Strunz Class:

VII/D.25-30 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 Shubnikovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Shubnikovite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Shubnikovite

Ca2Cu8(AsO4)6Cl(OH)·7(H2O) (?)
Dana No: 42.8.8.1 Strunz No: VII/D.25-30
Locality:

Notes: