"Freeze-Dried Specimens"

Brownish gray, translucent.

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.

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

Brown, earthy, massive; used for yellow pigment.

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

Sale

Nearly pure, green crystalline forsterite.

Light pink, massive, crystalline, translucent.

Good grade, brass-yellow copper ore, massive.

Spinel group; black, dull metallic luster; common iron oxide.

Feldspar group; pink cleavages showing perthitic texture, common potassium feldspar, Mohs’ hardness of 6.