"Avantor"

Pure kaolinite powder, 200 mesh.

Classic “peacock” aluminum ore.

Cut black mica cleavage sheets.

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

A classroom set that covers the major types of coal.

Clear rhombs showing double refraction.

Classic, white chalk, massive; from Cliffs of Dover, England.

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

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Bright metallic cubic cleavages; lead ore.