Ovamboite Mineral Data

Ovamboite Mineral Data

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General Ovamboite Information

Chemical Formula:

Cu20(Fe,Cu,Zn)6W2Ge6S32

Composition:

Molecular Weight = 3,470.24 gm

Vanadium 0.09 % V

Zinc 3.28 % Zn

Gallium 0.46 % Ga

Iron 4.67 % Fe

Copper 39.21 % Cu

Tin 0.03 % Sn

Germanium 9.86 % Ge

Molybdenum 1.00 % Mo

Arsenic 2.55 % As

Tungsten 9.70 % W

Sulfur 29.17 % S

______

100.00 %

Empirical Formula:

Cu_21.41Fe²⁺_2.9Zn_1.74W_1.83Mo_0.36V²⁺_0.06Sn_0.01Ge_4.71As_1.18Ga_0.23S_31.57

Environment:

In a germanium-bearing massive-sulfide base-metal deposit.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Tsumeb deposit, Ovamboland, Namibia, and (2) the Maikain deposit, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA1992-039

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Ovamboite Crystallography

Cell Dimensions:

a = 10.68, Z = 1; V = 1,218.19 Den(Calc)= 4.73

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n

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

By Intensity(I/I_o): 3.08(1)(222), 1.887(0.7)(440), 1.612(0.5)(622),2.67(0.2)(400), 1.225(0.15)(662), 1.333(0.1)(800), 1.543(0.1)(444),

Physical Properties of Ovamboite

Cleavage:

None

Color:

Gray.

Diaphaniety:

Opaque

Habit:

Cubic Crystals - Occurs as cubic shaped crystals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Ovamboite

RL Anisotrophism:

None.

RL Bireflectance:

None.

RL Color:

Pale yellowish pink with no internal reflections.

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ovamboite in Air**
λ	R	∑ R(λ)
470 nm	24.00
546 nm	24.30
589 nm	24.40
650 nm	24.00

**Calculated Relative Intensity Colors of Ovamboite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	370%
R

Calculated Properties of Ovamboite

Electron Density:

r_electron=4.37 gm/cc
note: r_Ovamboite=4.73 gm/cc.

Fermion Index

Fermion Index = 0.02864
Boson Index = 0.97136

Photoelectric:

PE_Ovamboite= 145.87 barns/electron
U=PE_Ovamboite x r_electron= 637.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ovamboite is Not Radioactive

Ovamboite Classification

Dana Class:

2.9.4.4 (2)Sulfides - Including Selenides and Tellurides

(2.9)where Am Bn Xp, with (m+n):p=1:1

(2.9.4)Germanite Group

2.9.4.1 Renierite (Cu,Zn)11(Ge,As)2Fe4S16 P 4₂c- 4 2m

2.9.4.2 Germanite Cu26Fe4Ge4S32 P 43n 4 3m

2.9.4.3 Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m

2.9.4.4 Ovamboite ! Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m

Strunz Class:

II/C.10-55 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.10 - Stannite group, Germanite series

II/C.10-10 Renierite (Cu,Zn)11(Ge,As)2Fe4S16 P 4₂c- 4 2m

II/C.10-15 Vinciennite Cu10Fe4Sn(As,Sb)S16 P 4₁22 4 2 2

II/C.10-20 Germanite Cu26Fe4Ge4S32 P 43n 4 3m

II/C.10-30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 P 43n 4 3m

II/C.10-40 Colusite Cu12-13V(As,Sb,Sn,Ge)3S16 P 43n 4 3m

II/C.10-45 Stibiocolusite Cu13V(Sb,As,Sn)3S16 P 43n 4 3m

II/C.10-47 Germanocolusite Cu13V(Ge,As)3S16 P 43n 4 3m

II/C.10-50 Arsenosulvanite Cu3(As,V)S4 P 43m 4 3m

II/C.10-50* Maikainite! Cu20(Fe,Cu)6Mo2Ge6S32 P 43n 4 3m

II/C.10-55 Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32 P 43n 4 3m

II/C.10-60 Sulvanite Cu3VS4 P 43m 4 3m

II/C.10-70 Polkovicite (Fe,Pb)3(Ge,Fe)1-xS4 F d3m 4/m 3 2/m

II/C.10-80 Morozeviczite (Pb,Fe)3Ge1-xS4 F d3m 4/m 3 2/m

Other Ovamboite Information

References:

NAME( CanMin, 42:1250) PHYS. PROP.(CanMin, 42:1250) OPTIC PROP.(CanMin, 42:1250)

See Also:

Links to other databases for Ovamboite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ovamboite

Cu20(Fe,Cu,Zn)6W2Ge6S32
Dana No: 2.9.4.4 Strunz No: II/C.10-55
Locality:

Notes: