Naquite

Naquite is a mineral of iron monosilicide, FeSi. It was discovered in the 1960s in Donetsk Oblast in Soviet Union, and named fersilicite, but was not approved by the International Mineralogical Association. It was later rediscovered in the Nagqu area of Tibet and given the name naquite. Naquite occurs together with other rare iron silicide minerals, xifengite (Fe₅Si₃) and linzhiite (FeSi₂).^[3]

Naquite
General
Category	Minerals
Formula	FeSi
IMA symbol	Naq[1]
Strunz classification	1.BB.15
Crystal system	Cubic
Crystal class	Isometric – tetartoidal H-M symbol (23) Space group P213
Unit cell	a = 4.48 Å, Z = 4
Identification
Color	Steel grey, tin white
Cleavage	None
Fracture	Brittle – conchoidal
Mohs scale hardness	6.5
Luster	Metallic
Streak	grayish black
Diaphaneity	Opaque
Specific gravity	6.1–6.2 (calc.)
References	[2][3]