Specimens

Good grade, brass-yellow copper ore, massive.

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

Red, classic oolitic texture.

Great for geology hardness tests.

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

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

White, fibrous, silky luster.

Brown, fluorescent crystals intergrown in dolomite rock.

Clear, euhedral points and sections.

Cleaned, pure, bright, metallic native copper.