Mineralogy Database

Larosite Mineral Data

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General Larosite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Ag)21(Pb,Bi)2S13
Help on Composition: Composition: Molecular Weight = 2,256.15 gm
   Copper   53.51 %  Cu
   Silver    9.56 %  Ag
   Bismuth   9.26 %  Bi
   Lead      9.18 %  Pb
   Sulfur   18.48 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Cu19Ag2PbBiS13
Help on Environment: Environment: Central portion of a vein with chalcocite and stromeyerite.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Foster mine, Cobalt, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Fred LaRose, a discoverer of silver ore at Cobalt.
Help on Name Pronunciation: Name Pronunciation: Larosite Say LAROSITE
Help on Synonym: Synonym: IMA1971-014

Larosite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9217:1:0.4856
Help on Cell Dimensions: Cell Dimensions: a = 22.15, b = 24.03, c = 11.67, Z = 10; V = 6,211.53 Den(Calc)= 6.03
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.982(1), 2.917(0.9), 2.846(0.6),

Physical Properties of Larosite

Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Metallic

Optical Properties of Larosite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, in gray and greenish buff.
Help on RL Color: RL Color: Whitish buff.
Help on RL Pleochroism: RL Pleochroism: Weak.

Calculated Properties of Larosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.44 gm/cc
note: Specific Gravity of Larosite =6.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PELarosite = 371.54 barns/electron
U=PELarosite x rElectron Density=2,021.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larosite is Not Radioactive

Larosite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.09)Dana Group Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho
Help on  Strunz Class: Strunz Class: 02.LB.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LB -With essential Pb
02.LB.35 Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho

Other Larosite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Larosite :
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.LB.35





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