Strüverite

(Ti,Ta,Fe)O2
Also known as
  • Strüverit
  • Strüverita
  • Strüverite (of Zambonini)
Variety of
Rutile
RutileTiO2

Where it forms, where it's found

45recorded 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

Optical

Optical type
Uniaxial (+)

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
73TaTantalumTantalum1180.948180.948
57.14%
26FeIronIron155.84555.845
17.64%
22TiTitaniumTitanium147.86747.867
15.12%
8OOxygenOxygen215.99931.998
10.10%
Total316.658100.00%

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

From Mindat formula

Synonyms

  • Strüverit
  • Strüverita
  • Strüverite (of Zambonini)

Classification

Dana
8th ed.

04.04.01.03

  • 04Simple OxidesClass
  • 04.04AX2Type
  • 04.04.01Rutile group (Tetragonal: P4/mnm)Group
  • 04.04.01.03StrüveriteSpecies
CIM
—

18.1.50

  • 18Niobates and TantalatesClass
  • 18.1Niobates and tantalates containing neither rare earths nor UGroup
  • 18.1.50StrüveriteSpecies

Literature, links & citation

Citations
  1. 1907Rend.Accad.Sci.fis.mat., Napoli (1907), ser.3, 13, 35
  2. 1908Prior, G. T., Zambonini, F. (1908) On Strüverite and its relation to Ilmenorutile. Mineralogical Magazine and Journal of the Mineralogical Society, 15 (68) 78-89 doi:10.1180/minmag.1908.015.68.07 DOI: 10.1180/minmag.1908.015.68.07
  3. 1966Lima de Faria, J., Quadrado, R. (1966) Ilmenorutile and struverite from Nampoça, Alto Ligonha, Mozambique. Garcia de Orta. Revista da Junta das Missões Geográficas e de Investigações do Ultramar, 14 (2) 305-310
  4. 2005(2005) Strüverite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Strüverite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/struverite-3812},
  note      = {Accessed 2026-05-11}
}