Ziesite Mineral Data

Ziesite Mineral Data +

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General Ziesite Information

Chemical Formula:

Cu2V+++++2O7

Composition:

Molecular Weight = 340.97 gm

Vanadium 29.88 % V 53.34 % V₂O₅

Copper 37.27 % Cu 46.66 % CuO

Oxygen 32.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂V⁵⁺₂O₇

Environment:

Polymorphic with blossite.

IMA Status:

Approved IMA 1973

Locality:

Izalco volcano, El Salvador. Link to MinDat.org Location Data.

Name Origin:

Named for Emanuel G. Sies (1884-1981), Geophysical Laboratory, Carnegie Institution, Washington D.C. USA.

Synonym:

ICSD 23479

PDF 26-569

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Ziesite Crystallography

Axial Ratios:

a:b:c =0.9576:1:1.2586

Cell Dimensions:

a = 7.689, b = 8.029, c = 10.106, Z = 4; beta = 110.25° V = 585.33 Den(Calc)= 3.87

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 3.06(1), 3.09(1), 3.6(1),

Crystal Structure:

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Hughes J M , Brown M A , Neues Jahrbuch fur Mineralogie, Monatshefte , 1989 (1989) p.41-47, The crystal structure of ziesite, beta-Cu2V2O7, a thortveitite-type, structure with a non-linear X-O-X inter-tetrahedral bond, Locality: synthetic

Physical Properties of Ziesite

Cleavage:

None

Color:

Black.

Density:

3.86

Diaphaniety:

Opaque

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

red brown

Optical Properties of Ziesite

Gladstone-Dale:

CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2726,KPDmeas= 0.2733,KC= 0.2607

Optical Data:

Biaxial (?), b=2.055

Calculated Properties of Ziesite

Electron Density:

r_electron=3.63 gm/cc
note: r_Ziesite=3.87 gm/cc.

Fermion Index

Fermion Index = 0.0009
Boson Index = 0.9991

Photoelectric:

PE_Ziesite= 22.56 barns/electron
U=PE_Ziesite x r_electron= 81.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ziesite is Not Radioactive

Ziesite Classification

Dana Class:

38.5.5.2 (38)Anhydrous Phosphates, etc

(38.5)with miscellaneous formulae

(38.5.5)Dana Group

38.5.5.1 Chervetite Pb2V2O7 P 2₁/a 2/m

38.5.5.2 Ziesite Cu2V2O7 A2/a 2/m

Strunz Class:

VII/A.20-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, waterfree divanadates [V2O7]4-

VII/A.20 - Ziesite - Chervetite series

VII/A.20-05 Petewilliamsite! (Ni,Co,Cu)30(As2O7)15 C 2 2

VII/A.20-10 Ziesite Cu2V2O7 A2/a 2/m

VII/A.20-20 Blossite Cu2V2O7 F dd2 mm2

VII/A.20-30 Chervetite Pb2V2O7 P 2₁/a 2/m

Other Ziesite Information

References:

PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Ziesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Ziesite

Cu2V+++++2O7
Dana No: 38.5.5.2 Strunz No: VII/A.20-10
Locality:

Notes: