"Gary K. benson"

Shiny crystal clusters and crystalline groups, this 'fools gold' is brassy and leaves a black streak.

Pyroxene group; dark green, pure cleaved fragments.

Deep purple crystal clusters.

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

Dark brown to black; polycrystalline zinc ore.

Pure, bright yellow, Frasch sulfur.

Cleaned, pure, bright, metallic native copper.

Great for geology hardness tests.

Brown, fluorescent crystals intergrown in dolomite rock.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Amphibole group; black, coarse, massive.

Bright blue crystalline veins and coatings in a matrix of mixed copper ore.

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

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

White, fine, massive, opaque to slightly translucent.

White, fibrous, silky luster.