Geerite Mineral Data

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

Search for Geerite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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 - 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

Search for Geerite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Geerite :

A Bijoux Google Search for Geerite
Adam's Minerals Google Search for Geerite
Cape Minerals Google Search for Geerite
Dakota Matrix Minerals Google Search for Geerite
Excalibur Mineral Corp. Google Search for Geerite
Exceptional Minerals Google Search for Geerite
John Betts Fine Minerals Search for Geerite
McDougall Minerals Google Search for Geerite
Mineral News Website Link
Rock and Mineral Shows Google Search for Geerite
Weinrich Minerals, Inc. Google Search for Geerite

Ask about Geerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: