Canfieldite Mineral Data

Canfieldite Mineral Data +

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General Canfieldite Information

Chemical Formula:

Ag8SnS6

Composition:

Molecular Weight = 1,174.05 gm

Silver 73.50 % Ag

Tin 10.11 % Sn

Sulfur 16.39 % S

______

100.00 %

Empirical Formula:

Ag₈SnS₆

Environment:

Forms a series with argyrodite,

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

Aullagas near Chayanta, northwest of Colquechaca, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named after Frederick A. Canfield (1849-1926), American mining engineer and mineral collector.

Synonym:

ICSD 42533

PDF 38-434

Canfieldite Image

Images:

Canfieldite

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

Canfieldite Crystallography

Axial Ratios:

a:b:c =2.0267:1:1.4174

Cell Dimensions:

a = 15.298, b = 7.548, c = 10.699, Z = 4; V = 1,235.41 Den(Calc)= 6.31

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P na2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.02(1), 1.863(0.5), 2.66(0.4),

Forms:

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Forms: [ 1 1 1] [ 0 1 0] [ 1 0 0] [ 0 0 1]

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Physical Properties of Canfieldite

Cleavage:

None

Color:

Black.

Density:

6.28

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

grayish black

Optical Properties of Canfieldite

RL Color:

Gray white with violet tint.

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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	350%
R

Calculated Properties of Canfieldite

Electron Density:

r_electron=5.61 gm/cc
note: r_Canfieldite=6.31 gm/cc.

Fermion Index

Fermion Index = 0.01803
Boson Index = 0.98197

Photoelectric:

PE_Canfieldite= 220.66 barns/electron
U=PE_Canfieldite x r_electron=1,238.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Canfieldite is Not Radioactive

Canfieldite Classification

Dana Class:

2.5.6.2 (2)Sulfides - Including Selenides and Tellurides

(2.5)where Am Bn Xp, with (m+n):p=3:2

(2.5.6)Dana Group

2.5.6.1 Argyrodite Ag8GeS6 Pna2 mm2

2.5.6.2 Canfieldite Ag8SnS6 P na2₁ mm2

Strunz Class:

II/B.08-20 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.08 - Argyrodite - Canfieldite series

II/B.08-05 Putzite! (Cu4.7Ag3.3)GeS6 F43m 4 3m

II/B.08-10 Argyrodite Ag8GeS6 Pna2 mm2

II/B.08-20 Canfieldite Ag8SnS6 P na2₁ mm2

Other Canfieldite Information

References:

NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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Print or Cut-and-Paste your Canfieldite Specimen Label here :

Canfieldite

Ag8SnS6
Dana No: 2.5.6.2 Strunz No: II/B.08-20
Locality:

Notes: