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

chromium carbide Chromium(II) carbide is a ceramic compound that exists in several chemical compositions: Cr3C2, Cr7C3, and Cr23C6. At standard conditions it exists as a gray solid. It is extremely hard and corrosion resistant. It is also a refractory compound, ...

. It was first described in 1983 for an occurrence in Liu village,

Tongbai County Tongbai County () is a county in the south of Henan province, China, bordering Hubei province to the south. The easternmost county-level division of the prefecture-level city of Nanyang, it has an area of and a population of 420,000. Administrat ...

(桐柏县),

Henan Province Henan (; or ; ; alternatively Honan) is a landlocked province of China, in the central part of the country. Henan is often referred to as Zhongyuan or Zhongzhou (), which literally means "central plain" or "midland", although the name is al ...

, China and named for the locality. It occurs in an

ultramafic Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed ...

rock deposit. It has also been found in the

Tibet Autonomous Region The Tibet Autonomous Region or Xizang Autonomous Region, often shortened to Tibet or Xizang, is a province-level autonomous region of the People's Republic of China in Southwest China. It was overlayed on the traditional Tibetan regions of � ...

and the Isovsky District, in the

Urals The Ural Mountains ( ; rus, Ура́льские го́ры, r=Uralskiye gory, p=ʊˈralʲskʲɪjə ˈɡorɨ; ba, Урал тауҙары) or simply the Urals, are a mountain range that runs approximately from north to south through western ...

of Russia.

References

Carbide minerals Chromium minerals Orthorhombic minerals Minerals in space group 62 {{Mineral-stub