Ziesite Mineral Data
General Ziesite Information
Chemical Formula:
Cu2V+++++2O7
Composition:
Molecular Weight = 340.97 gm
Vanadium 29.88 % V 53.34 % V2 O5
Copper 37.27 % Cu 46.66 % CuO
Oxygen 32.85 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Cu2 V5+ 2 O7
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.
Name Pronunciation:
Ziesite
Synonym:
ICSD 23479
PDF 26-569
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 - Prismatic H-M Symbol (2/m) Space Group: A2/a
X Ray Diffraction:
By Intensity(I/Io ): 3.06(1), 3.09(1), 3.6(1),
Physical Properties of Ziesite
Cleavage:
None
Color:
Black.
Density:
3.86
Diaphaneity:
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 Ncalc = 2.01
Optical Data:
Biaxial (?), b=2.055
Calculated Properties of Ziesite
Electron Density:
Bulk Density (Electron Density)=3.63 gm/cc note: Specific Gravity of Ziesite =3.87 gm/cc.
Fermion Index:
Fermion Index = 0.0009046683 Boson Index = 0.9990953317
Photoelectric:
PEZiesite = 22.56 barns/electronU=PEZiesite x r Electron Density= 81.95 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ziesite is Not Radioactive
Ziesite Classification
Dana Class:
38.05.05.02 (38) Anhydrous Phosphates, etc
(38.05) with miscellaneous formulae
(38.05.05) Dana Group
38.05.05.01 Chervetite Pb2V2O7 P 21 /a 2/m
38.05.05.02 Ziesite Cu2V2O7 A2/a 2/m
Strunz Class:
08.FA.10 08 - PHOSPHATES, ARSENATES, VANADATES
08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates
08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
08.FA.10 Ziesite Cu2V2O7 A2/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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Ziesite
Cu2V+++++2O7
Dana No: 38.05.05.02 Strunz No: 08.FA.10
Locality:
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