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Empressite Mineral Data
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General Empressite Information
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 Chemical Formula: |
AgTe |
| Composition: |
Molecular Weight = 235.27 gm |
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Silver 46.31 % Ag |
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Tellurium 53.69 % Te |
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______ |
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100.00 % |
| Empirical Formula: |
Ag1.01Te0.99 |
| Environment: |
Low temperature gold-poor hydrothermal vein deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1914 |
| Locality: |
Empress Josephine mine, Saguache County and Red Cloud mine, Bolder County, Colorado, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Empressite + Pronunciation  |
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Empressite Image |
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Images:
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Empressite Crystallography
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| Axial Ratios: |
a:b:c =0.4418:1:0.2295 |
| Cell Dimensions: |
a = 8.882, b = 20.1, c = 4.614, Z = 16; V = 823.73 Den(Calc)= 7.59 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb |
| 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), |
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Physical Properties of Empressite
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| Cleavage: |
None |
| Color: |
Bronze, Light bronze. |
| Density: |
7.5 - 7.6, Average = 7.55 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Compact - Occurs as a compact mass. |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Metallic |
| Streak: |
grayish black |
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Optical Properties of Empressite
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| RL Anisotrophism: |
Strong, gray to yellowish white to grayish blue. |
| RL Bireflectance: |
Moderate to strong. |
| RL Color: |
Grayish white with no internal reflections. |
| RL Pleochroism: |
Very strong, in gray to creamy white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Empressite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
40.10 |
45.80 |
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| 550 nm |
39.60 |
44.10 |
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| 589 nm |
39.40 |
43.20 |
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| 650 nm |
38.90 |
41.80 |
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Calculated Relative Intensity Colors of Empressite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Empressite
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| Electron Density: |
Bulk Density (Electron Density)=6.38 gm/cc
note: Specific Gravity of Empressite =7.59 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEEmpressite = 321.24 barns/electron
U=PEEmpressite x rElectron Density=2,050.92 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Empressite is Not Radioactive |
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Empressite Classification
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| Dana Class: |
02.08.24.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.08)where Am Bn Xp, with (m+n):p=1:1 |
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(02.08.24)Dana Group |
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02.08.24.01 Empressite AgTe Pmnb 2/m 2/m 2/m |
| Strunz Class: |
02.CB.80 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.80 Empressite AgTe Pmnb 2/m 2/m 2/m |
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Other Empressite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8, AmMin, v 89, p 1043) OPTIC PROP.(AmMin, v 89, p 1044) |
| 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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Print or Cut-and-Paste your Empressite Specimen Label here :
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Empressite
AgTe
Dana No: 02.08.24.01 Strunz No: 02.CB.80
Locality:
Notes:
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