Umangite Mineral Data

General Umangite Information

Chemical Formula:

Cu3Se2

Composition:

Molecular Weight = 348.56 gm

Copper 54.69 % Cu

Selenium 45.31 % Se

______

100.00 %

Empirical Formula:

Cu₃Se₂

Environment:

Found with other selenides in hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Sierra de Umango, La Rioja province in Argentina. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Name Pronunciation:

Umangite

Synonym:

ICSD 239

PDF 47-1745

Umangite Image

Images:

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

Images:

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

Images:

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

Axial Ratios:

a:b:c =0.5136:1:0.3434

Cell Dimensions:

a = 6.4, b = 12.46, c = 4.28, Z = 4; V = 341.30 Den(Calc)= 6.78

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.56(1), 1.829(0.9), 1.778(0.8),

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

Cleavage:

{010} Distinct, {001} Distinct

Color:

Blue black, Brownish black, Red violet.

Density:

5.62 - 6.78, Average = 6.2

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

black

Optical Properties of Umangite

RL Anisotrophism:

Very strong, fiery orange to straw-yellow with a rose tint.

RL Pleochroism:

Pronounced, reddish purple to grayish white.

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

Electron Density:

Bulk Density (Electron Density)=6.03 gm/cc
note: Specific Gravity of Umangite =6.78 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Umangite= 61.57 barns/electron
U=PE_Umangite x rElectron Density= 371.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Umangite is Not Radioactive

Umangite Classification

Dana Class:

02.05.01.01 (02)Sulfides - Including Selenides and Tellurides

(02.05)where Am Bn Xp, with (m+n):p=3:2

(02.05.01)Dana Group

02.05.01.01 Umangite Cu3Se2 P 2₁2₁2 2 2 2

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Ask about Umangite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Umangite

Cu3Se2
Dana No: 02.05.01.01 Strunz No: 02.BA.15c
Locality:

Notes: