Selenium Mineral Data (original) (raw)
General Selenium Information
Chemical Formula:
Se
Composition:
Molecular Weight = 78.96 gm
Selenium 100.00 % Se
______
100.00 %
Empirical Formula:
Se
Environment:
Low temperature due to sublimation of fumarolic vapors. Oxidation-reduction of selenium-bearing solutions in sandstone U and U-V deposits.
IMA Status:
Valid Species (Pre-IMA) 1828
Locality:
Grants District, McKinley County, New Mexico, USA. Link to MinDat.org Location Data.
Name Origin:
From the Greek, Selene, "goddess of the Moon" to contrast Tellure, "earth".
Name Pronunciation:
Selenium 
Synonym:
ICSD 22251
PDF 42-1425
Selen tellurium - Mixture with tellurium
Selenium Image
Images:
 |
Selenium Comments: Acicular crystals of native Selenium (up to 1 cm in length). Location: Ronneburg U deposit, Gera district, Thuringia, Germany.Scale: Specimen size 3 cm. © Thomas Witzke / Abraxas-Verlag |
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Selenium Crystallography
Axial Ratios:
a:c = 1:1.13467
Cell Dimensions:
a = 4.366, c = 4.954, Z = 3; V = 81.78 Den(Calc)= 4.81
Crystal System:
Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3121,P 3221
X Ray Diffraction:
By Intensity(I/Io): 3(1), 3.78(0.55), 2.072(0.35),
Forms:
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| | Forms:( 1 1 1) ( 1 1 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | -------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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| | Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York View Additional jPOWD Structure files for Selenium [1] [2] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Selenium
Cleavage:
{0112} Good
Color:
Gray, Purple gray, Reddish.
Density:
4.81
Diaphaneity:
Opaque
Fracture:
Flexible - Flexible fragments.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
2 - Gypsum
Luster:
Sub Metallic
Streak:
red
Optical Properties of Selenium
Dichroism (e):
cream white.
Dichroism (w):
brown.
Optical Data:
Uniaxial (+), w=3, e=4.04, bire=1.0400.
RL Anisotrophism:
Very strong.
RL Color:
White in air, darker white to grayish brown in oil, red in transmitted light.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Selenium in Air
| λ | R1 | R 2 |  |
∑ R1(λ) | ∑ R2(λ) |
|---|---|---|---|---|---|
| 400 nm | 28.40 | 38.40 |  |
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| 420 nm | 27.40 | 37.80 |  |
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| 440 nm | 26.40 | 37.20 |  |
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| 460 nm | 25.50 | 36.30 |  |
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| 480 nm | 24.80 | 35.40 |  |
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| 500 nm | 24.30 | 34.70 |  |
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| 520 nm | 24.00 | 34.40 |  |
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| 540 nm | 24.10 | 34.10 |  |
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| 560 nm | 24.40 | 34.00 |  |
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| 580 nm | 24.80 | 33.90 |  |
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| 600 nm | 25.40 | 33.80 |  |
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| 620 nm | 25.80 | 33.50 |  |
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| 640 nm | 26.00 | 33.30 |  |
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| 660 nm | 25.80 | 32.90 |  |
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| 680 nm | 25.20 | 32.40 |  |
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| 700 nm | 24.60 | 31.90 |  |
Calculated Relative Intensity Colors of Selenium in Air
| RelativeIntensity | 0% | 40% | 80% | 100% | 120% | 160% | 200% | 240% | 280% | 320% | 360% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| R1 | |||||||||||
| R2 |
Calculated Properties of Selenium
Electron Density:
Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Selenium =4.81 gm/cc.
Fermion Index:
Fermion Index = 0.07
Boson Index = 0.93
Photoelectric:
PESelenium = 81.52 barns/electron
U=PESelenium x rElectron Density= 337.68 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenium is Not Radioactive
Selenium Classification
Dana Class:
01.03.04.01 (01)Native Elements
(01.03)with semi-metallic and non-metallic elements
(01.03.04)Dana Group
01.03.04.01 Selenium Se P 3121,P 3221 3 2
01.03.04.02 Tellurium Te P 3121 3 2
Strunz Class:
01.CC.10 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
01.C - Metalloids and Nonmetals
01.CC -Sulfur-selenium-iodine
01.CC.10 Selenium Se P 3121,P 3221 3 2
01.CC.10 Tellurium Te P 3121 3 2
Other Selenium Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
See Also:
Links to other databases for Selenium :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Ask about Selenium 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 Espa�ol
Print or Cut-and-Paste your Selenium Specimen Label here :
Selenium
Se
Dana No: 01.03.04.01 Strunz No: 01.CC.10
Locality:
Notes: