Mineralogy Database

Roxbyite Mineral Data

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General Roxbyite Information

Help on Chemical  Formula: Chemical Formula: Cu1.78S
Help on Composition: Composition: Molecular Weight = 145.18 gm
   Copper  77.91 %  Cu
   Sulfur  22.09 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Cu1.78S
Help on Environment: Environment: Products of corrosion of a 1375 BC bronze harpoon head from a shipwreck.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Roxby Downs, AS, Australia. Eastern Mediterranean Sea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the locality.
Help on Name Pronunciation: Name Pronunciation: Roxbyite Say ROXBYITE

Roxbyite Image

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Comments: Bronzy, metallic, massive roxbyite associated with hematite, co-type sample.
Location: Olympic Dam mine, Roxby Downs, South Australia, Australia. Scale: See Image.
© Rruff Database

Roxbyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7407:1:0.4323
Help on Cell Dimensions: Cell Dimensions: a = 53.79, b = 30.9, c = 13.36, Z = 512; beta = 90° V = 22,205.80 Den(Calc)= 5.56
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.933(1), 2.375(0.9), 1.857(0.8),

Physical Properties of Roxbyite

Help on Cleavage: Cleavage: {100} Poor
Help on Color: Color: Bluish black.
Help on Density: Density: 5.555
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic - Dull

Optical Properties of Roxbyite

Help on RL Anisotrophism: RL Anisotrophism: Very weak.
Help on RL Color: RL Color: White to off-shite with a blue tinge.

Calculated Properties of Roxbyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.18 gm/cc
note: Specific Gravity of Roxbyite =5.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001656554
Boson Index = 0.998343446
Help on Photoelectric: Photoelectric: PERoxbyite = 36.38 barns/electron
U=PERoxbyite x rElectron Density= 188.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Roxbyite is Not Radioactive

Roxbyite 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.05d 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.05d Roxbyite Cu1.78S C 2/m 2/m

Other Roxbyite Information

Help on References: References: NAME( CanMin, 10/98) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Roxbyite :
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.05d





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