Varlamoffite

(Sn,Fe)(O,OH)2
IMA status
  • Approved
  • Grandfathered
  • Questionable
IMA symbol
Vlm
Also known as

Where it forms, where it's found

Type locality
Kalima
  1. Maniema
  2. DR Congo

-2.7149°, 26.2895°

57recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789106 – 6.5/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Colour
Yellow
Streak
Light yellow

Crystallography

Comment

No crystallography available

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
50SnTinTin1118.710118.710
49.35%
8OOxygenOxygen415.99963.996
26.60%
26FeIronIron155.84555.845
23.21%
1HHydrogenHydrogen21.0082.016
0.84%
Total240.567100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Souxit
  • Souxita
  • Souxite
  • Varlamoffiet

In other languages

German
Varlamoffit
Italian
Varlamoffite

Classification

Strunz
10th ed.

4.DB.05

  • 4OxidesClass
  • 4.DMetal: Oxygen = 1:2 and similarDivision
  • 4.DBWith medium-sized cations; chains of edge-sharing octahedraGroup
  • 4.DB.05VarlamoffiteSpecies
Dana
8th ed.

04.04.02.01

  • 04Simple OxidesClass
  • 04.04AX2Type
  • 04.04.02— unnamed intermediate level —Group
  • 04.04.02.01VarlamoffiteSpecies

Literature, links & citation

Citations
  1. 1947Buttgenbach, H. (1947) Les Minéraux de Belgique et du Congo belge. Dunod. 573pp.
  2. 1948Varlamoff, N. (1948) Materiaux pour l'étude du mineral d'étain (varlamoffite) occurrences, géologie et origine du minéral. Annales de la Société géologique de Belgique.
  3. 1949Fleischer, M. (1949) New mineral names. American Mineralogist, 34 (7-8). 618-620
  4. 1952Niggli, E. (1952). Untersuchungen an Varlamoffit. Leidse Geologische Mededelingen, 17(1), 207-214.
  5. 1952Russell, A., Vincent, E.A. (1952) On the occurrence of varlamoffite (partially hydrated stannic oxide) in Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society: 29(216): 817-826.
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Varlamoffite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/varlamoffite-4157},
  note      = {Accessed 2026-05-11}
}