Namibite Mineral Data
General Namibite Information
Chemical Formula:
Cu++Bi2(VO4)O2
Composition:
Molecular Weight = 628.44 gm
Vanadium 8.11 % V 14.47 % V2 O5
Copper 10.11 % Cu 12.66 % CuO
Bismuth 66.51 % Bi 74.14 % Bi2 O3
Oxygen 15.28 % O
______ ______
100.00 % 101.27 % = TOTAL OXIDE
Empirical Formula:
CuBi2 (VO4 )O2
IMA Status:
Approved IMA 1981
Locality:
Khorixas (formerly Welwitschia), northwestern Namibia. Link to MinDat.org Location Data.
Name Origin:
Named for the country in which it is found.
Name Pronunciation:
Namibite
Synonym:
ICSD 89724
PDF 47-1773
Namibite Image
Images:
Namibite
Comments: Dark green crystals of namibite on matrix.
Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany.
Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag
Namibite Crystallography
Axial Ratios:
a:b:c =3.2099:1:2.0073
Cell Dimensions:
a = 11.864, b = 3.696, c = 7.419, Z = 2; beta = 109.7° V = 306.28 Den(Calc)= 6.81
Crystal System:
Monoclinic Space Group: C 2/m,Cm,C 2
X Ray Diffraction:
By Intensity(I/Io ): 3.018(1), 3.574(0.75), 5.58(0.7),
Physical Properties of Namibite
Cleavage:
{100} Good
Color:
Dark green.
Density:
6.86
Diaphaneity:
Translucent
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
4.5-5 - Near Apatite
Streak:
pistachio green
Optical Properties of Namibite
Gladstone-Dale:
CI meas = 0.129 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = 0.123 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1615,KPDmeas = 0.1603,KC = 0.1842 Ncalc = 2.25 - 2.26
Optical Data:
Biaxial (-), a=2.1, 2V(Meas)=moderate.
Pleochroism (x):
yellow green.
Pleochroism (y):
pistachio green.
Pleochroism (z):
dark green.
Calculated Properties of Namibite
Electron Density:
Bulk Density (Electron Density)=5.76 gm/cc note: Specific Gravity of Namibite =6.81 gm/cc.
Fermion Index:
Fermion Index = 0.0002766353 Boson Index = 0.9997233647
Photoelectric:
PENamibite =1,271.11 barns/electronU=PENamibite x r Electron Density=7,327.83 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Namibite is Not Radioactive
Namibite Classification
Dana Class:
38.05.09.01 (38) Anhydrous Phosphates, etc
(38.05) with miscellaneous formulae
(38.05.09) Dana Group
38.05.09.01 Namibite CuBi2(VO4)O2 C 2/m,Cm,C 2 Mono
38.05.09.02 Urusovite ! Cu[AlAsO5] P 21 /c 2/m
Strunz Class:
08.BB.50 08 - PHOSPHATES, ARSENATES, VANADATES
08.B - Phosphates, etc. with Additional Anions, without H2O
08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
08.BB.50 Namibite CuBi2(VO4)O2 C 2/m,Cm,C 2 Mono
Other Namibite Information
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
See Also:
Links to other databases for Namibite :
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
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Print or Cut-and-Paste your Namibite Specimen Label here :
Namibite
Cu++Bi2(VO4)O2
Dana No: 38.05.09.01 Strunz No: 08.BB.50
Locality:
Notes:
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