Classroom Minerals

Small to moderate sized crystals within a mafic matrix and cleavage visible in some specimens.

Brownish gray, translucent.

Good grade, brass-yellow copper ore, massive.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

Spinel group; black, dull metallic luster; common iron oxide.

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

Cleaned, pure, bright, metallic native copper.

Red, classic oolitic texture.

Deep blue, massive, with nepheline; key feldspathoid.

Clear, pure cleavages, Mohs’ hardness of 2.