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Varlamoffite Mineral Data
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General Varlamoffite Information
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 Chemical Formula: |
(Sn,Fe)(O,OH)2 |
| Composition: |
Molecular Weight = 135.50 gm |
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Iron 10.30 % Fe 14.73 % Fe2O3 |
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Tin 65.71 % Sn 83.42 % SnO2 |
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Hydrogen 0.37 % H 3.32 % H2O |
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Oxygen 23.62 % O |
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______ ______ |
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100.00 % 101.48 % = TOTAL OXIDE |
| Empirical Formula: |
Sn0.75Fe3+0.25O1.5(OH)0.5 |
| Environment: |
Oxidized protions of stannite-cassiterite veins. |
| IMA Status: |
Not Approved IMA 1946 |
| Locality: |
Cligga mine, Cronwall, England. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Nicolas Varlamoff (1910-1976), Belgian geologist who collected the mineral. |
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Varlamoffite Image |
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Images:
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Varlamoffite Crystallography
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| Axial Ratios: |
a:c = 1:0.66454 |
| Cell Dimensions: |
a = 4.71, c = 3.13, Z = 1; V = 69.44 Den(Calc)= 3.24 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 41/mnm |
| X Ray Diffraction: |
By Intensity(I/Io): 1.75(1), 2.6(0.8), 3.33(0.8), |
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Physical Properties of Varlamoffite
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| Cleavage: |
None |
| Color: |
Yellow, Orange red. |
| Density: |
2.52 - 2.61, Average = 2.56 |
| Diaphaneity: |
Translucent to Opaque |
| Hardness: |
6-6.5 - Orthoclase-Pyrite |
| Luster: |
Waxy |
| Streak: |
light yellow |
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Optical Properties of Varlamoffite
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| Optical Data: |
NCalc= 1.57 - from Gladstone-Dale relationship (KC = 0.177) where Ncalc=Dcalc*KC+1
NCalc= 1.45 - from Gladstone-Dale relationship (KC = 0.177) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Varlamoffite
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| Electron Density: |
Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Varlamoffite =3.24 gm/cc.
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| Fermion Index: |
Fermion Index = 0.11
Boson Index = 0.89 |
| Photoelectric: |
PEVarlamoffite = 205.99 barns/electron
U=PEVarlamoffite x rElectron Density= 596.00 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Varlamoffite is Not Radioactive |
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Varlamoffite Classification
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| Dana Class: |
04.04.02.01 (04)Simple Oxides |
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(04.04)with a cation charge of 4+ (A++++ O2) |
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(04.04.02)Dana Group |
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04.04.02.01 Varlamoffite* (Sn,Fe)(O,OH)2 P 41/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 |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DB -With medium-sized cations; chains of edge-sharing octahedra |
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04.DB.05 Argutite GeO2 P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Rutile TiO2 P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Varlamoffite* (Sn,Fe)(O,OH)2 P 41/mnm 4/m 2/m 2/m |
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04.DB.05 Squawcreekite? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m |
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04.DB.05 Tugarinovite MoO2 P 21/n 2/m |
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04.DB.05 Tripuhyite FeSbO4 P 41/mnm 4/m 2/m 2/m |
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Other Varlamoffite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Varlamoffite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
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Print or Cut-and-Paste your Varlamoffite Specimen Label here :
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Varlamoffite
(Sn,Fe)(O,OH)2
Dana No: 04.04.02.01 Strunz No: 04.DB.05
Locality:
Notes:
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