Geerite Mineral Data

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General Geerite Information

Chemical Formula:

Cu8S5

Composition:

Molecular Weight = 668.70 gm

Copper 76.02 % Cu

Sulfur 23.98 % S

______

100.00 %

Empirical Formula:

Cu₈S₅

Environment:

Replacing sphalerite along cleavage traces.

IMA Status:

Approved IMA 1980

Locality:

In DeKalb Township, St. Lawrence Co., New York, and from Cuchillo, Winston district, Sierra Co., New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

To honor the original collector, Adam Geer, of Utica, New York, USA.

Name Pronunciation:

Geerite

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Geerite Crystallography

Axial Ratios:

a:c = 1:12.22976

Cell Dimensions:

a = 3.83, c = 46.84, Z = 3; V = 595.04 Den(Calc)= 5.60

Crystal System:

TrigonalSpace Group: R 3m, R 3m, or R 32

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

By Intensity(I/I_o): 3.128(1), 1.918(0.5), 1.637(0.3),

Physical Properties of Geerite

Color:

White, Blue gray.

Diaphaneity:

Opaque

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Optical Properties of Geerite

RL Anisotrophism:

Moderate, in yellow.

RL Color:

Bluish white.

RL Pleochroism:

Weak.

Calculated Properties of Geerite

Electron Density:

Bulk Density (Electron Density)=5.23 gm/cc
note: Specific Gravity of Geerite =5.60 gm/cc.

Fermion Index:

Fermion Index = 0.0017982333
Boson Index = 0.9982017667

Photoelectric:

PE_Geerite= 35.58 barns/electron
U=PE_Geerite x rElectron Density= 185.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Geerite is Not Radioactive

Geerite Classification

Dana Class:

02.04.07.06 (02)Sulfides - Including Selenides and Tellurides

(02.04)where Am Bn Xp, with (m+n):p=2:1

(02.04.07)Chalcocite Group ([Cu]2-x S] formulae)

02.04.07.01 Chalcocite Cu2S P 2₁/c 2/m

02.04.07.02 Djurleite Cu31S16 P 2₁/n 2/m

02.04.07.03 Digenite Cu9S5 R 3m 3 2/m

02.04.07.04 Roxbyite Cu1.78S C 2/m 2/m

02.04.07.05 Anilite Cu7S4 P nma 2/m 2/m 2/m

02.04.07.06 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig

02.04.07.07 Spionkopite Cu1.4S P 3m1 ? 3m

Strunz Class:

02.BA.05c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BA -With Cu, Ag, Au

02.BA.05c Geerite Cu8S5 R 3m, R 3m, or R 32 Trig

Other Geerite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Geerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Geerite Specimen Label here :

Geerite

Cu8S5
Dana No: 02.04.07.06 Strunz No: 02.BA.05c
Locality:

Notes: