Tongbaite

(repeating unit)Cr3C2IMA symbolTgb[1]Strunz classification1.BA.15Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPnmaUnit cella = 5.52 Å, b = 11.48 Å
c = 2.82 Å; Z = 4IdentificationColorPale brownish yellow; pale violet in reflected lightCrystal habitPrismatic crystals, pseudohexagonalTenacityBrittleMohs scale hardness8.5LusterMetallicDiaphaneityOpaqueSpecific gravity6.64 calculatedReferences[2][3][4]

Tongbaite is a rare mineral that has the chemical formula Cr3C2, or chromium carbide.

It was first described in 1983 for an occurrence in Liu village, Tongbai County (桐柏县), Henan Province, China and named for the locality.[3] It occurs in an ultramafic rock deposit.[2] It has also been found in the Tibet Autonomous Region and the Isovsky District, in the Urals of Russia.[3]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Handbook of Mineralogy
  3. ^ a b c Mindat.org
  4. ^ Webmineral data


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