Umangite Mineral Data + Say UMANGITE


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General Umangite Information
Help on Chemical Formula: Chemical Formula: Cu3Se2
Help on Composition: Composition: Molecular Weight = 348.56 gm
   Copper    54.69 %  Cu
   Selenium  45.31 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu3Se2
Help on Environment: Environment: Found with other selenides in hydrothermal veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Sierra de Umango, La Rioja province in Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: ICSD 239
  PDF 47-1745
 

Umangite Image

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Umangite   Athabascaite   Berzelianite

Comments: Reflected light photomicrograph of umangite (pinkish), berzelianite (gray), athabascaite (small white areas in berzelianite), calcite (olive).
Location: Sierra de Umango, La Rioja, Argentin. Scale: Not Given.
© Jeff Weissman / Photographic Guide to Mineral Species
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Umangite   Bellidoite   Berzelianite

Comments: Dark bellidoite inclusions in black berzelianite with white umangite.
Location: Habri, near Tisnov, Jihomoravsky, Czech Republi. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Umangite   Tyrrellite

Comments: Bright metallic partial cubic tyrrellite crystal in altering umangite.
Location: Eagle Claims, near Hal Lake, Beaverlodge, Saskatchewan, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Umangite   Berzelianite

Comments: Black massive umangite intergrown with dark blue metallic berzelianite.
Location: Borsov, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Umangite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5136:1:0.3434
Help on Cell Dimensions: Cell Dimensions: a = 6.4, b = 12.46, c = 4.28, Z = 4; V = 341.30 Den(Calc)= 6.78
Help on Crystal System: Crystal System: Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 21212
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.56(1), 1.829(0.9), 1.778(0.8),
Click Here for Large Umangite Structure Window Crystal Structure:

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Heyding R D , Murray R M , Canadian Journal of Chemistry , 54 (1976) p.841-848, Crystal structures of Cu1.8Se, Cu3Se2, alpha- and gamma=CuSe, CuSe2, and CuSe2II, Locality: Beaverlodge Region, Saskatchewan, Canada

 

Physical Properties of Umangite

Help on Cleavage: Cleavage: [010] Distinct, [001] Distinct
Help on Color: Color: Blue black, Brownish black, Red violet.
Help on Density: Density: 5.62 - 6.78, Average = 6.2
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Umangite

Help on RL Anisotrophism: RL Anisotrophism: Very strong, fiery orange to straw-yellow with a rose tint.
Help on RL Pleochroism: RL Pleochroism: Pronounced, reddish purple to grayish white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Umangite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   25.60   24.40 
   
 420 nm   23.30   23.00 
 440 nm   21.00   21.60 
 460 nm   19.00   20.30 
 480 nm   17.30   19.10 
 500 nm   15.80   18.10 
 520 nm   14.60   17.20 
 540 nm   13.60   16.50 
 560 nm   13.20   16.10 
 580 nm   13.50   16.00 
 600 nm   15.00   16.10 
 620 nm   17.50   16.40 
 640 nm   20.70   16.80 
 660 nm   24.20   17.40 
 680 nm   27.60   18.10 
 700 nm   30.60   18.80 
Calculated Relative Intensity Colors of Umangite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 580%
R1                        
R2                        
 

Calculated Properties of Umangite

Help on Electron Density: Electron Density:

relectron=6.03 gm/cc
note: rUmangite =6.78 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.03443
Boson Index = 0.96557
Help on Photoelectric: Photoelectric:

PEUmangite = 61.57 barns/electron
U=PEUmangite x relectron= 371.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Umangite is Not Radioactive
 

Umangite Classification
Help on Dana Class: Dana Class: 2.5.1.1 (2)Sulfides - Including Selenides and Tellurides
  (2.5)where Am Bn Xp, with (m+n):p=3:2
  (2.5.1)Dana Group
 
2.5.1.1 Umangite Cu3Se2 P 21212 2 2 2
Help on Strunz Class: Strunz Class: II/B.03-50 II - Sulfides and sulphosalts
  II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Selenides with predominant Copper
  II/B.03 - Bertzeliannite - Athabascaite series
 
II/B.03-10 Berzelianite Cu2Se F m3m 4/m 3 2/m
 
II/B.03-20 Bellidoite Cu2Se P 41/m 4/m
 
II/B.03-30 Crookesite Cu7(Tl,Ag)Se4 I 4 4
 
II/B.03-40 Sabatierite Cu4TlSe3 P 4/mmm 4/m 2/m 2/m
 
II/B.03-50 Umangite Cu3Se2 P 21212 2 2 2
 
II/B.03-60 Athabascaite Cu5Se4 Unk Ortho
 

Other Umangite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Umangite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Umangite Specimen Label here :

Umangite

Cu3Se2
Dana No: 2.5.1.1 Strunz No: II/B.03-50
Locality:

 

Notes:

 
 
   
 
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