Xieite

Xieite is an iron chromium oxide mineral with formula Fe²⁺Cr₂O₄. It is a member of the spinel group and a high pressure polymorph of chromite.^[3]

Xieite
General
Category	Oxide minerals
Formula	Fe2+Cr2O4
IMA symbol	Xi[1]
Strunz classification	4.BB.25
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Bbmm
Unit cell	a = 9.462(6) Å b = 9.562(9) Å c = 2.916(1) Å: Z = 4
Identification
Formula mass	453.91 g/mol
Color	Golden yellow
Specific gravity	5.63
References	[2][3]

It was discovered in samples taken from the Suizhou meteorite which fell in 1986 in the Zengdu District of China.^[3]