"Dessus de bouchon"

A classroom set that covers the major types of coal.

Pure kaolinite powder, 200 mesh.

Exemplary display of hexoctahedral crystal shape.

Deep purple crystal clusters.

Light pink, massive, crystalline, translucent.

Nearly pure, green crystalline forsterite.

Pure, bright yellow, Frasch sulfur.

Brown, earthy, massive; used for yellow pigment.

Pyroxene group; dark green, pure cleaved fragments.

Feldspar group; white-to-gray cleavages of sodic plagioclase; some show twinning.

Cut black mica cleavage sheets.

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

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