Mineralogy Database

Chenguodaite Mineral Data

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General Chenguodaite Information

Help on Chemical  Formula: Chemical Formula: Ag9FeTe2S4
Help on Composition: Composition: Molecular Weight = 1,406.90 gm
   Iron        3.97 %  Fe
   Silver     68.77 %  Ag
   Tellurium  18.05 %  Te
   Sulfur      9.21 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ag8.97Fe2+Te1.99S4.04
Help on Environment: Environment: Occurs in high grade Au-Ag-Cu ores.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Bunan deposit, Shandong Province, People�s Republic of China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Chen Guoda (1912-2004), geologist and the founder of the Geological Department of Central South University, China.
Help on Synonym: Synonym: IMA2004-042a

Chenguodaite Image

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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

Chenguodaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8619:1:1.0951
Help on Cell Dimensions: Cell Dimensions: a = 12.769, b = 14.814, c = 16.223, Z = 9; V = 3,068.74 Den(Calc)= 6.85
Help on Crystal System: Crystal System: Orthorhombic Space Group: Ortho
Help on X Ray Diffraction: 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),

Physical Properties of Chenguodaite

Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Chenguodaite

Help on RL Anisotrophism: RL Anisotrophism: Light gray with no internal reflections.
Help on RL Color: RL Color: None.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Chenguodaite in Air
λ R  ∑ R(λ) 
 400 nm   22.10   
 420 nm   27.20 
 440 nm   28.00 
 460 nm   27.90 
 470 nm   27.80 
 480 nm   27.60 
 500 nm   27.00 
 520 nm   26.20 
 540 nm   25.70 
 546 nm   25.80 
 560 nm   25.50 
 580 nm   25.30 
 589 nm   25.30 
 600 nm   25.40 
 620 nm   25.40 
 640 nm   25.40 
 650 nm   25.60 
 660 nm   25.70 
 680 nm   25.70 
 700 nm   25.80 
Calculated Relative Intensity Colors of Chenguodaite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 350%

Calculated Properties of Chenguodaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.00 gm/cc
note: Specific Gravity of Chenguodaite =6.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChenguodaite = 244.19 barns/electron
U=PEChenguodaite x rElectron Density=1,464.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chenguodaite is Not Radioactive

Chenguodaite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.20)Dana Group Chenguodaite! Ag9FeTe2S4 Ortho Ortho
Help on  Strunz Class: Strunz Class: 02.BA.60 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.60 Chenguodaite! Ag9FeTe2S4 Ortho Ortho

Other Chenguodaite Information

Help on References: References: NAME( Chinese Science Bulletin 2008, 53(22)) PHYS. PROP.( Chinese Science Bulletin 2008, 53(22)) OPTIC PROP.( Chinese Science Bulletin 2008, 53(22))
Help on See Also: 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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Dana No: Strunz No: 02.BA.60





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