General Umangite Information
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Chemical Formula: |
Cu3Se2 |
Composition: |
Molecular Weight = 348.56 gm |
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Copper 54.69 % Cu |
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Selenium 45.31 % Se |
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______ |
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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. |
Synonym: |
ICSD 239 |
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PDF 47-1745 |
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Umangite Image |
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Umangite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 3.56(1), 1.829(0.9), 1.778(0.8), |
Crystal Structure:
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drag2 - RMB Resize/Rotate
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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
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Physical Properties of Umangite
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Cleavage: |
[010] Distinct, [001] Distinct |
Color: |
Blue black, Brownish black, Red violet. |
Density: |
5.62 - 6.78, Average = 6.2 |
Diaphaniety: |
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 |
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Optical Properties of Umangite
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
25.60 |
24.40 |

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| 420 nm |
23.30 |
23.00 |

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| 440 nm |
21.00 |
21.60 |

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| 460 nm |
19.00 |
20.30 |

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| 480 nm |
17.30 |
19.10 |

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| 500 nm |
15.80 |
18.10 |

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| 520 nm |
14.60 |
17.20 |

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| 540 nm |
13.60 |
16.50 |

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| 560 nm |
13.20 |
16.10 |

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| 580 nm |
13.50 |
16.00 |

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| 600 nm |
15.00 |
16.10 |

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| 620 nm |
17.50 |
16.40 |

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| 640 nm |
20.70 |
16.80 |

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| 660 nm |
24.20 |
17.40 |

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| 680 nm |
27.60 |
18.10 |

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| 700 nm |
30.60 |
18.80 |

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Calculated Relative Intensity Colors of Umangite in Air
Relative Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
580% |
| R1 |
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| R2 |
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Calculated Properties of Umangite
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Electron Density: |
relectron=6.03 gm/cc note: rUmangite =6.78 gm/cc. |
Fermion Index |
Fermion Index = 0.03443 Boson Index = 0.96557 |
Photoelectric: |
PEUmangite = 61.57 barns/electron U=PEUmangite x relectron= 371.28 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Umangite is Not Radioactive |
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Umangite Classification
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Dana Class: |
2.5.1.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.5)where Am Bn Xp, with (m+n):p=3:2 |
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(2.5.1)Dana Group |
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2.5.1.1 Umangite Cu3Se2 P 21212 2 2 2 |
Strunz Class: |
II/B.03-50 II - Sulfides and sulphosalts |
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II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Selenides with predominant Copper |
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II/B.03 - Bertzeliannite - Athabascaite series |
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II/B.03-10 Berzelianite Cu2Se F m3m 4/m 3 2/m |
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II/B.03-20 Bellidoite Cu2Se P 41/m 4/m |
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II/B.03-30 Crookesite Cu7(Tl,Ag)Se4 I 4 4 |
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II/B.03-40 Sabatierite Cu4TlSe3 P 4/mmm 4/m 2/m 2/m |
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II/B.03-50 Umangite Cu3Se2 P 21212 2 2 2 |
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II/B.03-60 Athabascaite Cu5Se4 Unk Ortho |
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Other Umangite Information
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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 - 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 :
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Umangite
Cu3Se2
Dana No: 2.5.1.1 Strunz No: II/B.03-50
Locality:
Notes:
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