Mineralogy Database

Empressite Mineral Data

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General Empressite Information

Help on Chemical  Formula: Chemical Formula: AgTe
Help on Composition: Composition: Molecular Weight = 235.27 gm
   Silver     46.31 %  Ag
   Tellurium  53.69 %  Te
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ag1.01Te0.99
Help on Environment: Environment: Low temperature gold-poor hydrothermal vein deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Empress Josephine mine, Saguache County and Red Cloud mine, Bolder County, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Empressite + Pronunciation Say EMPRESSITE

Empressite Image

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  Empressite   Tellurium

Comments: Bronze-colored microcrystals of empressite with bright native tellurium crystals.
Location: Rex mine, Boulder County, Colorado, USA. Scale: 1.9 x 1.4 x 0.7 cm.
© Richard Dale / Dale Minerals

Empressite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4418:1:0.2295
Help on Cell Dimensions: Cell Dimensions: a = 8.882, b = 20.1, c = 4.614, Z = 16; V = 823.73 Den(Calc)= 7.59
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.699(1)(241), 2.2205(0.34)(400), 3.3277(0.3)(240),3.1742(0.26)(141), 2.3138(0.23)(261), 3.8(0.21)(031), 2.1371(0.2)(271), 2.8873(0.15)(231), 4.012(0.15)(111),

Physical Properties of Empressite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bronze, Light bronze.
Help on Density: Density: 7.5 - 7.6, Average = 7.55
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Compact - Occurs as a compact mass.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black

Optical Properties of Empressite

Help on RL Anisotrophism: RL Anisotrophism: Strong, gray to yellowish white to grayish blue.
Help on RL Bireflectance: RL Bireflectance: Moderate to strong.
Help on RL Color: RL Color: Grayish white with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: Very strong, in gray to creamy white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Empressite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   40.10   45.80 
 550 nm   39.60   44.10 
 589 nm   39.40   43.20 
 650 nm   38.90   41.80 
Calculated Relative Intensity Colors of Empressite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%

Calculated Properties of Empressite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.38 gm/cc
note: Specific Gravity of Empressite =7.59 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEEmpressite = 321.24 barns/electron
U=PEEmpressite x rElectron Density=2,050.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Empressite is Not Radioactive

Empressite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.08)where Am Bn Xp, with (m+n):p=1:1
  (02.08.24)Dana Group Empressite AgTe Pmnb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.CB.80 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
02.CB.80 Empressite AgTe Pmnb 2/m 2/m 2/m

Other Empressite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin, v 89, p 1043) OPTIC PROP.(AmMin, v 89, p 1044)
Help on See Also: See Also: Links to other databases for Empressite :
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.CB.80





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