Specimens

Red, classic oolitic texture.

Feldspar group; pink cleavages showing perthitic texture, common potassium feldspar, Mohs’ hardness of 6.

Light gray, compact, hard, opaque, microcrystalline silica mineral.

Clear to yellow translucent.

Clear, pure cleavages, Mohs’ hardness of 2.

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

A textbook example of pure crystalline carbon which is extermely soft.

Earthy, yellow brown iron ore.

Amphibole group; black, coarse, massive.

Cleaned, pure, bright, metallic native copper.