9 Photos
Humite
Chemical Formula	(Mg,Fe)7(SiO4)3(F,OH)2.
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	6
Specific Gravity	3.20-3.32
Color	White, yellow, dark orange, brown
Streak	White
Luster	Vitreous
Refractive Index	n = 1.607 - 1.643 n = 1.619 - 1.653 n = 1.639 - 1.675
Diaphaneity	Transparent
Cleavage	Poor
Fracture	Uneven to subconchoidal

Humite is a mineral found in the volcanically ejected masses of Vesuvius. It was first described in 1813 and named for Abraham Hume (1749-1838).