Cassiterite Mineral Data
General Cassiterite Information
Chemical Formula:
SnO2
Composition:
Molecular Weight = 150.71 gm
Tin 78.77 % Sn 100.00 % SnO2
Oxygen 21.23 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
SnO2
Environment:
Granite pegmatites and alluvial placer deposits.
IMA Status:
Valid Species (Pre-IMA) 1832
Locality:
Cornwall, Wales, Great Britain. Link to MinDat.org Location Data.
Name Origin:
From the Greek kassiteros - "tin."
Name Pronunciation:
Cassiterite + Pronunciation
Synonym:
ICSD 39173
PDF 41-1445
Staringite - Mixture with ferrotapiolite
Tin Ore
Wood Tin
Cassiterite Image
Images:
Cassiterite
Comments: Very brilliant black crystals of cassiterite on white mica.
Location: Xue Bao Diang, Sichuan, China.
Scale: Size Not Given.
© Fabre Minerals
Images:
Cassiterite
Comments: Gemmy, doubly terminated cassiterite on quartz-mica matrix.
Location: Langcangjiang river area, Yunnan, China.
Scale: 2.7 x 2.2 x 1.8 cm.
© Fabre Minerals
Cassiterite Crystallography
Axial Ratios:
a:c = 1:0.65808
Cell Dimensions:
a = 4.738, c = 3.118, Z = 2; V = 69.99 Den(Calc)= 7.15
Crystal System:
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnm
X Ray Diffraction:
By Intensity(I/Io ): 3.351(1), 2.644(0.81), 1.765(0.63),
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Physical Properties of Cassiterite
Cleavage:
{100} Perfect, {110} Indistinct
Color:
Brown, Brownish black, Colorless, Green, Gray.
Density:
6.8 - 7, Average = 6.9
Diaphaneity:
Transparent to translucent to opaque
Fracture:
Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Habit:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Streak:
brownish white
Optical Properties of Cassiterite
Dichroism (e):
yellow.
Dichroism (w):
red brown.
Gladstone-Dale:
CI meas = -0.062 (Fair) - where the CI = (1-KPDmeas /KC ) CI calc = -0.025 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1466,KPDmeas = 0.1519,KC = 0.143 Ncalc = 1.97 - 2.02
Optical Data:
Uniaxial (+), w=1.99-2.01, e=2.093-2.1, bire=0.0900-0.1030.
RL Anisotrophism:
Strong.
RL Color:
Light gray with white to brownish internal reflections.
RL Pleochroism:
Strong to very weak.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cassiterite in Air
λ
R1
R 2
∑ R1 (λ)
∑ R2 (λ)
400 nm
11.70
13.20
420 nm
11.60
13.00
440 nm
11.50
12.80
460 nm
11.40
12.60
480 nm
11.30
12.50
500 nm
11.20
12.40
520 nm
11.00
12.20
540 nm
11.00
12.10
560 nm
10.90
12.00
580 nm
10.90
12.00
600 nm
10.80
12.00
620 nm
10.80
12.00
640 nm
10.70
12.00
660 nm
10.70
12.00
680 nm
10.60
12.00
700 nm
10.60
12.00
Calculated Relative Intensity Colors of Cassiterite in Air
Relative Intensity
0%
90%
100%
180%
270%
360%
450%
540%
630%
720%
810%
R1
R2
Calculated Properties of Cassiterite
Electron Density:
Bulk Density (Electron Density)=6.26 gm/cc note: Specific Gravity of Cassiterite =7.15 gm/cc.
Fermion Index:
Fermion Index = 0.13 Boson Index = 0.87
Photoelectric:
PECassiterite = 247.66 barns/electronU=PECassiterite x r Electron Density=1,550.92 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cassiterite is Not Radioactive
Cassiterite Classification
Dana Class:
04.04.01.05 (04) Simple Oxides
(04.04) with a cation charge of 4+ (A++++ O2)
(04.04.01) Rutile group (Tetragonal: P4/mnm)
04.04.01.01 Rutile TiO2 P 4/mnm 4/m 2/m 2/m
04.04.01.02 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m
04.04.01.03 Struverite ? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m
04.04.01.04 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m
04.04.01.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m
04.04.01.06 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m
04.04.01.07 Argutite GeO2 P 4/mnm 4/m 2/m 2/m
04.04.01.08 Squawcreekite ? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m
04.04.01.09 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m
Strunz Class:
04.DB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
04.D - Metal:Oxygen = 1:2 and similar
04.DB -With medium-sized cations; chains of edge-sharing octahedra
04.DB.05 Argutite GeO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Rutile TiO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Varlamoffite * (Sn,Fe)(O,OH)2 P 41 /mnm 4/m 2/m 2/m
04.DB.05 Squawcreekite ? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m
04.DB.05 Tugarinovite MoO2 P 21 /n 2/m
04.DB.05 Tripuhyite FeSbO4 P 41 /mnm 4/m 2/m 2/m
Other Cassiterite Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
See Also:
Links to other databases for Cassiterite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - Philatelic Mineralogy
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - Tradeshop.com - The Rainbow of Gems
21 - University of Colorado - Mineral Structure Data
22 - WWW-MINCRYST
23 - theimage
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Cassiterite
SnO2
Dana No: 04.04.01.05 Strunz No: 04.DB.05
Locality:
Notes:
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