Stannoidite Mineral Data

General Stannoidite Information

Chemical Formula:

Cu8Fe3Sn2S12

Composition:

Molecular Weight = 1,298.12 gm

Iron 12.91 % Fe

Copper 39.16 % Cu

Tin 18.29 % Sn

Sulfur 29.64 % S

______

100.00 %

Empirical Formula:

Cu₈Fe²⁺₃Sn₂S₁₂

Environment:

In hydrothermal Cu-Sn deposits.

IMA Status:

Approved IMA 1969

Locality:

Konjo mine, Okayama Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for its similarity to stannite.

Name Pronunciation:

Stannoidite + Pronunciation

Synonym:

ICSD 41894

PDF 22-237

Stannoidite Image

Images:

Stannoidite

Comments: Polished section (PPL) image showing a rim of V-stannoidite on colusite (co) grain in massive bornite (bn).
Location: Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: Picture Size 0.25 mm.
© National Resouces of Canada

Stannoidite Crystallography

Axial Ratios:

a:b:c =1.9925:1:2.9796

Cell Dimensions:

a = 10.76, b = 5.4, c = 16.09, Z = 2; V = 934.89 Den(Calc)= 4.61

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: I 222

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

By Intensity(I/I_o): 3.11(1), 1.906(0.7), 1.621(0.2),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Kudoh Y , Takeuchi Y , Zeitschrift fur Kristallographie , 144 (1976) p.145-160, The superstructure of stannoidite, Locality: Konjo mine, Japan

Physical Properties of Stannoidite

Cleavage:

None

Color:

Brass brown.

Density:

4.29

Diaphaneity:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4 - Fluorite

Luster:

Metallic

Streak:

brown gray

Optical Properties of Stannoidite

RL Anisotrophism:

Strong, dark orange-red to yellow-gray.

RL Color:

Pinkish brown.

RL Pleochroism:

Distinct, light salmon-brown to brown.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Stannoidite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	19.50	20.40
420 nm	19.40	20.80
440 nm	19.30	21.20
460 nm	19.60	21.70
480 nm	20.30	22.40
500 nm	21.20	23.30
520 nm	22.20	24.20
540 nm	23.40	25.20
560 nm	24.60	26.30
580 nm	25.90	27.50
600 nm	27.10	28.70
620 nm	28.30	30.00
640 nm	29.50	31.20
660 nm	30.60	32.30
680 nm	31.70	33.40
700 nm	32.60	34.20

**Calculated Relative Intensity Colors of Stannoidite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%
R₁
R₂

Calculated Properties of Stannoidite

Electron Density:

Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Stannoidite =4.61 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Stannoidite= 77.74 barns/electron
U=PE_Stannoidite x rElectron Density= 332.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stannoidite is Not Radioactive

Stannoidite Classification

Dana Class:

02.09.03.03 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.03)Mawsonite Group

02.09.03.01 Mawsonite Cu6Fe2SnS8 P 4m2 4 2m

02.09.03.02 Chatkalite Cu6FeSn2S8 P 4m2 4 2m

02.09.03.03 Stannoidite Cu8Fe3Sn2S12 I 222 2 2 2

Strunz Class:

02.CB.15c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CB -With Zn, Fe, Cu, Ag, Au, etc

02.CB.15c Stannoidite Cu8Fe3Sn2S12 I 222 2 2 2

Other Stannoidite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Stannoidite :
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
15 - WWW-MINCRYST

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Ask about Stannoidite here :
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Print or Cut-and-Paste your Stannoidite Specimen Label here :

Stannoidite

Cu8Fe3Sn2S12
Dana No: 02.09.03.03 Strunz No: 02.CB.15c
Locality:

Notes: