Mineralogy Database

Umangite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Umangite Say UMANGITE
Help on Synonym: Synonym: ICSD 239
  PDF 47-1745

Umangite Image

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  Athabascaite   Umangite   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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  Tyrrellite   Umangite

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 - Disphenoidal H-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),

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 Diaphaneity: Diaphaneity: 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
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 580%

Calculated Properties of Umangite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.03 gm/cc
note: Specific Gravity of Umangite =6.78 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEUmangite = 61.57 barns/electron
U=PEUmangite x rElectron Density= 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: (02)Sulfides - Including Selenides and Tellurides
  (02.05)where Am Bn Xp, with (m+n):p=3:2
  (02.05.01)Dana Group Umangite Cu3Se2 P 21212 2 2 2
Help on  Strunz Class: Strunz Class: 02.BA.15c 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.15c Umangite Cu3Se2 P 21212 2 2 2

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 - 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.15c





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