Rickardite Mineral Data

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 Rickardite Image in a New Browser Window Images:
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Rickardite   Cameronite   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: OrthorhombicSpace 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),
Click Here for Large Rickardite Structure Window Crystal Structure:

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Forman S A , Peacock M A , American Mineralogist , 34 (1949) p.441-451, Crystal structure of rickardite, Cu4-xTe2

 

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
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 480%
R1                      
R2                      
 

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: 02.16.15.01 (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.15)Dana Group
 
02.16.15.01 Rickardite Cu7Te5 Unk Ortho
 
02.16.15.02 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Rickardite

Cu7Te5
Dana No: 02.16.15.01 Strunz No: 02.BA.20a
Locality:

 

Notes: