Mineralogy Database

Cuprite Mineral Data

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General Cuprite Information

Help on Chemical  Formula: Chemical Formula: Cu2O
Help on Composition: Composition: Molecular Weight = 143.09 gm
   Copper  88.82 %  Cu  100.00 % Cu2O
   Oxygen  11.18 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2O
Help on Environment: Environment: Oxidized zone of copper deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Commonly in the copper deposits of SW USA and in Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin, cuprum, meaning copper. Chalcotrichite from the Greek, meaning "hairy copper."
Help on Name Pronunciation: Name Pronunciation: Cuprite Say CUPRITE
Help on Synonym: Synonym: Chalcotrichite
  ICSD 63281
  PDF 5-667
  Red oxide of copper

Cuprite Image

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Comments: Dark red ball or sphere of cuprite crystals set on a pearly white dolomite crystal matrix.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: 5 x 2.5 x 4 cm.
© Dan Weinrich

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  Cuprite   Chrysocolla

Comments: Semi-metallic, dark reddish gray, cuprite crystals on blue chrysocolla.
Location: Mashamba West mine, Shaba, Congo. Scale: 7.5 x 4.7 x 2.3 cm.
© Fabre Minerals

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Comments: Red, acicular chalcotrichite crystals as a fine, fibrous red mass on matrix.
Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Cuprite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 4.2696, Z = 2; V = 77.83 Den(Calc)= 6.11
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P n3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.465(1), 2.135(0.37), 1.51(0.27),

Physical Properties of Cuprite

Help on Cleavage: Cleavage: {111} Imperfect
Help on Color: Color: Brown red, Purple red, Red, Black.
Help on Density: Density: 6.1
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Capillary - Very slender and long, like a thread or hair (e.g. millerite).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: brownish red

Optical Properties of Cuprite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.296 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.294 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3028,KPDmeas= 0.3033,KC= 0.234
Ncalc = 2.43
Help on Optical Data: Optical Data: Isotropic, n=2.85.
Help on RL Color: RL Color: Gray blue with internal red reflections.
Help on RL Pleochroism: RL Pleochroism: Anomalous.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cuprite in Air
λ R  ∑ R(λ) 
 400 nm   32.10   
 420 nm   32.20 
 440 nm   32.30 
 460 nm   31.70 
 480 nm   30.40 
 500 nm   28.80 
 520 nm   27.50 
 540 nm   26.30 
 560 nm   25.50 
 580 nm   24.80 
 600 nm   24.40 
 620 nm   23.90 
 640 nm   23.60 
 660 nm   23.40 
 680 nm   23.20 
 700 nm   23.10 
Calculated Relative Intensity Colors of Cuprite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%

Calculated Properties of Cuprite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.64 gm/cc
note: Specific Gravity of Cuprite =6.11 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.00005367
Boson Index = 0.99994633
Help on Photoelectric: Photoelectric: PECuprite = 40.46 barns/electron
U=PECuprite x rElectron Density= 228.05 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cuprite is Not Radioactive

Cuprite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.01)with a cation charge of 1+ (A+2 O)
  (04.01.01)Dana Group Cuprite Cu2O P n3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.AA.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.A - Metal:Oxygen = 2.1 and 1:1
  04.AA -Cation:Anion (M:O) = 2:1 (and 1.8:1)
04.AA.10 Cuprite Cu2O P n3m 4/m 3 2/m

Other Cuprite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Cuprite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Glendale Community College
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 - MinDAT
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - Philatelic Mineralogy
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Tradeshop.com - The Rainbow of Gems
22 - University of Colorado - Mineral Structure Data
24 - YupRocks
25 - theimage

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Dana No: Strunz No: 04.AA.10





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