"Avantor"

Light pink, massive, crystalline, translucent.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Spinel group; iron-black, massive; natural magnet.

Pyroxene group; dark green, pure cleaved fragments.

Deep purple crystal clusters.

Deep blue, massive, with nepheline; key feldspathoid.

Dark brown to black; polycrystalline zinc ore.

Exemplary display of hexoctahedral crystal shape.

Feldspar group; calcium end member plagioclase crystals in pyroxene matrix.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Nearly pure, green crystalline forsterite.

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

Amphibole group; black, coarse, massive.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Good grade, brass-yellow copper ore, massive.