Mineralogy Database

Rickardite Mineral Data

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General Rickardite Information

Help on Chemical  Formula: Chemical Formula: Cu7Te5
Help on Composition: Composition: Molecular Weight = 1,082.82 gm
   Copper     41.08 %  Cu
   Tellurium  58.92 %  Te
             100.00 % 
Help on Empirical Formula: Empirical Formula: Cu7Te5
Help on Environment: Environment: A late-stage mineral of low-temperature hydrothermal origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1903
Help on Locality: Locality: Good Hope mine, Vulcan, Gunnison Co., Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Thomas Arthur Rickard (1864-1953), mining engineer and Editor of the Engineering and Mining Journal, New York and London.
Help on Name Pronunciation: Name Pronunciation: Rickardite + Pronunciation Say RICKARDITE
Help on Synonym: Synonym: ICSD 24173
  PDF 26-1117

Rickardite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Cameronite   Rickardite   Vulcanite

Comments: Gray metallic massive cameronite showing subconchoidal fracture associated with purple rickardite and bronzy plates of vulcanite in a mass of tellurium, co-type specimen.
Location: Good Hope mine, Vulcan District, Gunnison County, Colorado, USA. Scale: See Image.
© Rruff Database

Rickardite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.2012:1:0.6142
Help on Cell Dimensions: Cell Dimensions: a = 4.0032, b = 19.893, c = 12.22, Z = 4; V = 973.15 Den(Calc)= 7.39
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.07(1), 3.36(0.6), 1.988(0.4),2.55(0.4), 1.158(0.3), 1.706(0.2), 2.82(0.2),

Physical Properties of Rickardite

Help on Cleavage: Cleavage: None
Help on Color: Color: Violet, Purple red.
Help on Density: Density: 7.54
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black

Optical Properties of Rickardite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Pleochroism: RL Pleochroism: Strong, carmine to violet-gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Rickardite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   29.40   37.40 
 420 nm   26.80   34.80 
 440 nm   24.20   32.20 
 460 nm   21.20   29.10 
 480 nm   17.80   25.80 
 500 nm   14.90   22.80 
 520 nm   13.30   20.30 
 540 nm   13.00   18.40 
 560 nm   15.60   18.00 
 580 nm   20.20   18.40 
 600 nm   26.50   19.80 
 620 nm   33.20   21.30 
 640 nm   39.40   24.80 
 660 nm   45.00   28.00 
 680 nm   49.40   31.80 
 700 nm   53.80   35.60 
Calculated Relative Intensity Colors of Rickardite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 480%

Calculated Properties of Rickardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.32 gm/cc
note: Specific Gravity of Rickardite =7.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PERickardite = 231.48 barns/electron
U=PERickardite x rElectron Density=1,462.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rickardite is Not Radioactive

Rickardite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.15)Dana Group Rickardite Cu7Te5 Unk Ortho Oosterboschite (Pd,Cu)7Se3 Unk Ortho
Help on  Strunz Class: Strunz Class: 02.BA.20a 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.20a Rickardite Cu7Te5 Unk Ortho

Other Rickardite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Rickardite :
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.20a





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