Chaoite
A disputed carbon allotrope — 'white carbon' — reported from shock-fused graphite gneiss in the Ries crater, Bavaria.
Intro adapted from Wikipedia (CC BY-SA).
Chaoite is an IMA-recognized mineral species in the native element class, with the chemical formula C.
It crystallizes in the hexagonal crystal system (space group P6/mmm).
Key properties: Mohs hardness 1–2; specific gravity 3.43.
IMA symbol Ch, IMA status: approved, named in 1968.
Found in shock-metamorphosed graphite gneisses and meteorites.
It is found associated with Graphite, zircon, rutile, pseudobrookite, magnetite, nickeliferous pyrrhotite, baddeleyite.
The name refers to Edward Ching-Te Chao (1919–), Chinese-American petrologist with the U.S. Geological Survey, Washington, D.C, USA.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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