Mineralogy Database

Billingsleyite Mineral Data

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General Billingsleyite Information

Help on Chemical  Formula: Chemical Formula: Ag7AsS6
Help on Composition: Composition: Molecular Weight = 1,022.40 gm
   Silver   73.85 %  Ag
   Arsenic   7.33 %  As
   Sulfur   18.82 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Ag7AsS6
Help on Environment: Environment: Believed to have occurred in a body of high-grade silver ore.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: In the North Lily mine, East Tintic district, Juab Co., Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Paul Billingsley (1887-1962), mining geologist, who discovered the North Lily mine, and collected the type material.
Help on Name Pronunciation: Name Pronunciation: Billingsleyite + Pronunciation Say BILLINGSLEYITE
Help on Synonym: Synonym: ICSD 75126
  PDF 45-1366

Billingsleyite Image

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Comments: Gray-black billingsleyite crystals on matrix with famatinite, arsenopyrite.
Location: Grube Clara, Oberwolfach, Schwarzwald, Germany. Scale: Picture size 1.0 x 0.6 cm.
© Diederik Visser

Billingsleyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9979:1:0.7044
Help on Cell Dimensions: Cell Dimensions: a = 14.96, b = 14.99, c = 10.56, Z = 8; V = 2,368.08 Den(Calc)= 5.74
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: C 2221
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.03(1), 2.47(0.7), 2.8(0.7),

Physical Properties of Billingsleyite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Lead gray.
Help on Density: Density: 5.9 - 5.94, Average = 5.92
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic

Calculated Properties of Billingsleyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.14 gm/cc
note: Specific Gravity of Billingsleyite =5.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014113625
Boson Index = 0.9985886375
Help on Photoelectric: Photoelectric: PEBillingsleyite = 194.26 barns/electron
U=PEBillingsleyite x rElectron Density= 999.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Billingsleyite is Not Radioactive

Billingsleyite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.06)Dana Group Billingsleyite Ag7AsS6 C 2221 2 2 2
Help on  Strunz Class: Strunz Class: 02.KB.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.K - Sulfarsenates, Sulfantimonates
  02.KB -Sulfarsenates with additional S
02.KB.05 Billingsleyite Ag7AsS6 C 2221 2 2 2

Other Billingsleyite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Billingsleyite :
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.KB.05





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