Mineralogy Database

Geerite Mineral Data

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General Geerite Information

Help on Chemical  Formula: Chemical Formula: Cu8S5
Help on Composition: Composition: Molecular Weight = 668.70 gm
   Copper  76.02 %  Cu
   Sulfur  23.98 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Cu8S5
Help on Environment: Environment: Replacing sphalerite along cleavage traces.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: 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.
Help on Name Origin: Name Origin: To honor the original collector, Adam Geer, of Utica, New York, USA.
Help on Name Pronunciation: Name Pronunciation: Geerite Say GEERITE

Geerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:12.22976
Help on Cell Dimensions: Cell Dimensions: a = 3.83, c = 46.84, Z = 3; V = 595.04 Den(Calc)= 5.60
Help on Crystal System: Crystal System: Trigonal Space Group: R 3m, R 3m, or R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.128(1), 1.918(0.5), 1.637(0.3),

Physical Properties of Geerite

Help on Color: Color: White, Blue gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Metallic

Optical Properties of Geerite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, in yellow.
Help on RL Color: RL Color: Bluish white.
Help on RL Pleochroism: RL Pleochroism: Weak.

Calculated Properties of Geerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.23 gm/cc
note: Specific Gravity of Geerite =5.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017982333
Boson Index = 0.9982017667
Help on Photoelectric: Photoelectric: PEGeerite = 35.58 barns/electron
U=PEGeerite x rElectron Density= 185.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Geerite is Not Radioactive

Geerite Classification

Help on  Dana Class: Dana Class: (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) Chalcocite Cu2S P 21/c 2/m Djurleite Cu31S16 P 21/n 2/m Digenite Cu9S5 R 3m 3 2/m Roxbyite Cu1.78S C 2/m 2/m Anilite Cu7S4 P nma 2/m 2/m 2/m Geerite Cu8S5 R 3m, R 3m, or R 32 Trig Spionkopite Cu1.4S P 3m1 ? 3m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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

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Dana No: Strunz No: 02.BA.05c





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