Crossite

Crossite
Crossite from California
General
Category	Amphibole - Inosilicates
Formula (repeating unit)	Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2
Identification
Color	blue, blue-green
Mohs scale hardness	6
Streak	light blue

Crossite is an inosilicate double chain sodic amphibole and is a rare silicate mineral belonging to the riebeckite group. It is considered an intermediate between the amphiboles glaucophane and magnesioriebeckite, which form a series.IMA status: discredited 1997.

Crossite is named after Charles Whitman Cross, an American USGS petrologist.