Namibite Mineral Data

General Namibite Information

Chemical Formula:

Cu++Bi2(VO4)O2

Composition:

Molecular Weight = 628.44 gm

Vanadium 8.11 % V 14.47 % V₂O₅

Copper 10.11 % Cu 12.66 % CuO

Bismuth 66.51 % Bi 74.14 % Bi₂O₃

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

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

By Intensity(I/I_o): 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:

PE_Namibite=1,271.11 barns/electron
U=PE_Namibite x rElectron 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 ï¿½ 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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Ask about Namibite here :
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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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