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Chenguodaite Mineral Data
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General Chenguodaite Information
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 Chemical Formula: |
Ag9FeTe2S4 |
| Composition: |
Molecular Weight = 1,406.90 gm |
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Iron 3.97 % Fe |
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Silver 68.77 % Ag |
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Tellurium 18.05 % Te |
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Sulfur 9.21 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag8.97Fe2+Te1.99S4.04 |
| Environment: |
Occurs in high grade Au-Ag-Cu ores. |
| IMA Status: |
Approved IMA 2005 (Dana # Added) |
| Locality: |
Bunan deposit, Shandong Province, People�s Republic of China. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Chen Guoda (1912-2004), geologist and the founder of the Geological Department of Central South University, China. |
| Synonym: |
IMA2004-042a |
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Chenguodaite Image |
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Images:
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Chenguodaite
Comments: BSE Image of coexisting chenguodaite (U1) and galena (Gn), part of the grain is extracted for Gandolfi camera diffraction. (Chinese Science Bulletin 2008, 53(22)).
Location: Bunan deposit, Shandong Province, People’s Republic of China.
Scale: See Image.
© Chinese Science Bulletin |
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Chenguodaite Crystallography
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| Axial Ratios: |
a:b:c =0.8619:1:1.0951 |
| Cell Dimensions: |
a = 12.769, b = 14.814, c = 16.223, Z = 9; V = 3,068.74 Den(Calc)= 6.85 |
| Crystal System: |
Orthorhombic Space Group: Ortho |
| X Ray Diffraction: |
By Intensity(I/Io): 3.265(1), 2.188(0.71), 6.726(0.69),6.416(0.39), 1.949(0.33), 5.951(0.33), 2.123(0.31), 2.981(0.24), |
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Physical Properties of Chenguodaite
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| Diaphaneity: |
Opaque |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Habit: |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
| Hardness: |
2-3 - Gypsum-Calcite |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Chenguodaite
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| RL Anisotrophism: |
Light gray with no internal reflections. |
| RL Color: |
None. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Chenguodaite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
22.10 |
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| 420 nm |
27.20 |
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| 440 nm |
28.00 |
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| 460 nm |
27.90 |
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| 470 nm |
27.80 |
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| 480 nm |
27.60 |
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| 500 nm |
27.00 |
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| 520 nm |
26.20 |
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| 540 nm |
25.70 |
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| 546 nm |
25.80 |
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| 560 nm |
25.50 |
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| 580 nm |
25.30 |
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| 589 nm |
25.30 |
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| 600 nm |
25.40 |
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| 620 nm |
25.40 |
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| 640 nm |
25.40 |
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| 650 nm |
25.60 |
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| 660 nm |
25.70 |
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| 680 nm |
25.70 |
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| 700 nm |
25.80 |
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Calculated Relative Intensity Colors of Chenguodaite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
350% |
| R |
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Calculated Properties of Chenguodaite
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| Electron Density: |
Bulk Density (Electron Density)=6.00 gm/cc
note: Specific Gravity of Chenguodaite =6.85 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEChenguodaite = 244.19 barns/electron
U=PEChenguodaite x rElectron Density=1,464.06 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chenguodaite is Not Radioactive |
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Chenguodaite Classification
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| Dana Class: |
03.07.20.01 (03)Sulfides - Sulfosalts |
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(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.07.20)Dana Group |
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03.07.20.01 Chenguodaite! Ag9FeTe2S4 Ortho Ortho |
| Strunz Class: |
02.BA.60 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BA -With Cu, Ag, Au |
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02.BA.60 Chenguodaite! Ag9FeTe2S4 Ortho Ortho |
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Other Chenguodaite Information
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| References: |
NAME( Chinese Science Bulletin 2008, 53(22)) PHYS. PROP.( Chinese Science Bulletin 2008, 53(22)) OPTIC PROP.( Chinese Science Bulletin 2008, 53(22)) |
| See Also: |
Links to other databases for Chenguodaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Chenguodaite Specimen Label here :
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Chenguodaite
Ag9FeTe2S4
Dana No: 03.07.20.01 Strunz No: 02.BA.60
Locality:
Notes:
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