Mineralogy Database

Canfieldite Mineral Data

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General Canfieldite Information

Help on Chemical  Formula: Chemical Formula: Ag8SnS6
Help on Composition: Composition: Molecular Weight = 1,174.05 gm
   Silver  73.50 %  Ag
   Tin     10.11 %  Sn
   Sulfur  16.39 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Ag8SnS6
Help on Environment: Environment: Forms a series with argyrodite,
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1894
Help on Locality: Locality: Aullagas near Chayanta, northwest of Colquechaca, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Frederick A. Canfield (1849-1926), American mining engineer and mineral collector.
Help on Name Pronunciation: Name Pronunciation: Canfieldite + Pronunciation Say CANFIELDITE
Help on Synonym: Synonym: ICSD 42533
  PDF 38-434

Canfieldite Image

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Comments: Dull, black pseudo-octahedral crystals of canfieldite.
Location: Gallofa vein, Colquechaca, Chayanta, Potosi, Bolivia. Scale: Crystal size 2 cm.
© Dave Barthelmy

Canfieldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0267:1:1.4174
Help on Cell Dimensions: Cell Dimensions: a = 15.298, b = 7.548, c = 10.699, Z = 4; V = 1,235.41 Den(Calc)= 6.31
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P na21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.02(1), 1.863(0.5), 2.66(0.4),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 0 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Canfieldite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 6.28
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black

Optical Properties of Canfieldite

Help on RL Color: RL Color: Gray white with violet tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Canfieldite in Air
λ R  ∑ R(λ) 
 400 nm   29.70   
 420 nm   28.60 
 440 nm   27.50 
 460 nm   26.70 
 480 nm   26.10 
 500 nm   25.60 
 520 nm   25.30 
 540 nm   25.10 
 560 nm   24.90 
 580 nm   24.80 
 600 nm   24.90 
 620 nm   25.00 
 640 nm   25.10 
 660 nm   25.20 
 680 nm   25.20 
 700 nm   25.20 
Calculated Relative Intensity Colors of Canfieldite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 350%

Calculated Properties of Canfieldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.61 gm/cc
note: Specific Gravity of Canfieldite =6.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECanfieldite = 220.66 barns/electron
U=PECanfieldite x rElectron Density=1,238.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Canfieldite is Not Radioactive

Canfieldite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.05)where Am Bn Xp, with (m+n):p=3:2
  (02.05.06)Argyrodite Group Argyrodite Ag8GeS6 Pna2 mm2 Canfieldite Ag8SnS6 P na21 mm2
Help on  Strunz Class: Strunz Class: 02.BA.35 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.35 Argyrodite Ag8GeS6 Pna2 mm2
02.BA.35 Canfieldite Ag8SnS6 P na21 mm2
02.BA.35 Putzite! (Cu4.7Ag3.3)GeS6 F43m 4 3m

Other Canfieldite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Canfieldite :
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.BA.35





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