"gray K. Besonson"

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.