Varlamoffite Mineral Data

General Varlamoffite Information

Chemical Formula:

(Sn,Fe)(O,OH)2

Composition:

Molecular Weight = 135.50 gm

Iron 10.30 % Fe 14.73 % Fe₂O₃

Tin 65.71 % Sn 83.42 % SnO₂

Hydrogen 0.37 % H 3.32 % H₂O

Oxygen 23.62 % O

______ ______

100.00 % 101.48 % = TOTAL OXIDE

Empirical Formula:

Sn_0.75Fe³⁺_0.25O_1.5(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.

Varlamoffite Image

Images:

Varlamoffite

Comments: Yellowish earthy varlamoffite masses with quartz.
Location: Saint Austell, Cornwall, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Varlamoffite Crystallography

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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/mnm

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

By Intensity(I/I_o): 1.75(1), 2.6(0.8), 3.33(0.8),

Physical Properties of Varlamoffite

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

Optical Properties of Varlamoffite

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

Calculated Properties of Varlamoffite

Electron Density:

Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Varlamoffite =3.24 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Varlamoffite= 205.99 barns/electron
U=PE_Varlamoffite x rElectron Density= 596.00 barns/cc.

Radioactivity:

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

Varlamoffite Classification

Dana Class:

04.04.02.01 (04)Simple Oxides

(04.04)with a cation charge of 4+ (A++++ O2)

(04.04.02)Dana Group

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

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 Varlamoffite Information

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 :

Varlamoffite

(Sn,Fe)(O,OH)2
Dana No: 04.04.02.01 Strunz No: 04.DB.05
Locality:

Notes: