| Crossite | |
| Category: | Amphibole – Inosilicates |
| Formula: | Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 |
| Color: | blue, blue-green |
| System: | Monoclinic |
| Mohs: | 6 |
| Luster: | Vitreous |
| Streak: | light blue |
| Diaphaneity: | Transparent to translucent |
| Gravity: | 3.16 |
| Opticalprop: | Biaxial (-) |
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.[1] IMA status: discredited 1997.
Crossite is named after Charles Whitman Cross, an American USGS petrologist.