Gallite Mineral Data

Gallite Mineral Data +

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General Gallite Information

Chemical Formula:

CuGaS2

Composition:

Molecular Weight = 197.40 gm

Gallium 35.32 % Ga

Copper 32.19 % Cu

Sulfur 32.49 % S

______

100.00 %

Empirical Formula:

CuGaS₂

Environment:

In base-metal vein deposits with relatively high gallium content.

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

At Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

For the mineral's gallium content.

Synonym:

ICSD 28736

PDF 25-279

Gallite Image

Images:

Gallite

Comments: A mixture of massive high grade ore with grains of gallite (gray) occuring with germanite and renierite. Most of what can be seen is the renierite, which has reddish and purple iridescence.
Location: Tsumeb, Namibia. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Gallite Crystallography

Axial Ratios:

a:c = 1:1.95887

Cell Dimensions:

a = 5.35, c = 10.48, Z = 4; V = 299.96 Den(Calc)= 4.37

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42d

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

By Intensity(I/I_o): 3.064(1), 1.876(0.7), 1.611(0.6),

Crystal Structure:

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Abrahams S C , Bernstein J L , Journal of Chemical Physics , 59 (1973) p.5415-5420, Piezoelectric nonlinear optic CuGaS2 and CuInS2 crystal structure:, Sublattice distortion in AIBIIIC2VI and AIIBIVC2V type chalcopyrites, Locality: Synthetic sample

View Additional jPOWD Structure files for Gallite
[1]

Physical Properties of Gallite

Color:

Gray.

Density:

4.2

Diaphaniety:

Opaque

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Metallic

Streak:

grayish black

Optical Properties of Gallite

RL Anisotrophism:

Low.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Gallite in Air**
λ	R	∑ R(λ)
400 nm	22.00
420 nm	21.80
440 nm	21.60
460 nm	21.30
480 nm	20.80
500 nm	20.40
520 nm	19.70
540 nm	19.20
560 nm	18.80
580 nm	18.60
600 nm	18.70
620 nm	18.80
640 nm	18.90
660 nm	19.10
680 nm	19.40
700 nm	19.50

**Calculated Relative Intensity Colors of Gallite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	460%
R

Calculated Properties of Gallite

Electron Density:

r_electron=4.07 gm/cc
note: r_Gallite=4.37 gm/cc.

Fermion Index

Fermion Index = 0.00243
Boson Index = 0.99757

Photoelectric:

PE_Gallite= 36.07 barns/electron
U=PE_Gallite x r_electron= 146.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gallite is Not Radioactive

Gallite Classification

Dana Class:

2.9.1.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.1)Chalcopyrite Group (Tetragonal: I4¯2d)

2.9.1.1 Chalcopyrite CuFeS2 I 42d 4 2m

2.9.1.2 Eskebornite CuFeSe2 I 42d 4 2m

2.9.1.3 Gallite CuGaS2 I 42d 4 2m

2.9.1.4 Roquesite CuInS2 I 42d 4 2m

2.9.1.5 Lenaite AgFeS2 I 42d 4 2m

2.9.1.6 Laforetite! AgInS2 I 42d 4 2m

Strunz Class:

II/C.03-30 II - Sulfides and sulphosalts

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

II/C.03 - Chalcopyrite group and related compounds

II/C.03-10 Chalcopyrite CuFeS2 I 42d 4 2m

II/C.03-20 Eskebornite CuFeSe2 I 42d 4 2m

II/C.03-25 Lenaite AgFeS2 I 42d 4 2m

II/C.03-30 Gallite CuGaS2 I 42d 4 2m

II/C.03-40 Roquesite CuInS2 I 42d 4 2m

II/C.03-50 Laforetite! AgInS2 I 42d 4 2m

Other Gallite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Gallite :
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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Print or Cut-and-Paste your Gallite Specimen Label here :

Gallite

CuGaS2
Dana No: 2.9.1.3 Strunz No: II/C.03-30
Locality:

Notes: