Specimens

Red, classic oolitic texture.

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

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

Clear to yellow translucent.

Clear, pure cleavages, Mohs’ hardness of 2.

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

Earthy, yellow brown iron ore.

Cleaned, pure, bright, metallic native copper.

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

Pure kaolinite powder, 200 mesh.