Naumannite Mineral Data

Naumannite Mineral Data
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General Naumannite Information

Help on Chemical Formula: Chemical Formula: Ag2Se
Help on Composition: Composition: Molecular Weight = 294.70 gm
   Silver    73.21 %  Ag
   Selenium  26.79 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag2Se
Help on Environment: Environment: In hydrothermal veins associated with other selenides, quartz, and carbonates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Tilkerode (Abberode) and St. Anreasberg, Harz Mountains, Saxony-Anhalt, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Carl Friedrich Naumann (1797-1873), German mineralogist and crystallographer.
Help on Name Pronunciation: Name Pronunciation: Naumannite + Pronunciation Say NAUMANNITE
Help on Synonym: Synonym: ICSD 15213
  PDF 24-1041
 

Naumannite Image

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Naumannite

Comments: Black crystal of Naumannite in a quartz-lined vug.
Location: DeLamar mine, DeLamar, Owyhee County, Idaho. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Naumannite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6135:1:1.097
Help on Cell Dimensions: Cell Dimensions: a = 4.336, b = 7.067, c = 7.753, Z = 4; V = 237.57 Den(Calc)= 8.24
Help on Crystal System: Crystal System: Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 2.66(1), 2.23(0.6),
Click Here for Large Naumannite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Wiegers G A , American Mineralogist , 56 (1971) p.1882-1888, The crystal structure of the low-temperature form of silver selenide

 

Physical Properties of Naumannite

Help on Cleavage: Cleavage: {???} Perfect, {???} Perfect, Perfect
Help on Color: Color: Grayish black, Iron black.
Help on Density: Density: 6.5 - 8, Average = 7.25
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Naumannite

Help on RL Anisotrophism: RL Anisotrophism: Distinct but weak, light gray to dark gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Naumannite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   36.30   40.70 
   
 420 nm   37.00   40.60 
 440 nm   37.70   40.50 
 460 nm   38.00   40.20 
 480 nm   38.10   39.60 
 500 nm   37.80   38.90 
 520 nm   37.00   38.10 
 540 nm   35.70   37.30 
 560 nm   34.60   36.70 
 580 nm   33.80   36.20 
 600 nm   33.20   35.80 
 620 nm   32.70   35.50 
 640 nm   32.20   35.00 
 660 nm   31.80   34.70 
 680 nm   31.50   34.30 
 700 nm   31.20   34.80 
Calculated Relative Intensity Colors of Naumannite in Air
Relative
Intensity		    0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270%
R1                      
R2                      
 

Calculated Properties of Naumannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.16 gm/cc
note: Specific Gravity of Naumannite =8.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PENaumannite = 213.70 barns/electron
U=PENaumannite x rElectron Density=1,529.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Naumannite is Not Radioactive
 

Naumannite Classification
Help on Dana Class: Dana Class: 02.04.01.02 (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.01)Acanthite Group
 
02.04.01.01 Acanthite Ag2S P 21/n 2/m
 
02.04.01.02 Naumannite Ag2Se P 212121 2 2 2
 
02.04.01.03 Aguilarite Ag4SeS P 212121 2 2 2
Help on Strunz Class: Strunz Class: 02.BA.30b 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.30b Aguilarite Ag4SeS P 212121 2 2 2
 
02.BA.30b Naumannite Ag2Se P 212121 2 2 2
 

Other Naumannite Information
Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Naumannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Naumannite

Ag2Se
Dana No: 02.04.01.02 Strunz No: 02.BA.30b
Locality:

 

Notes: