"WardsSci000478"

White to gray, medium to coarse-grained, crystalline.

Sale

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

Massive sedimentary gypsum with a moh's hardness 2..

A textbook example of pure crystalline carbon which is extermely soft.

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

Talc is the softest know mineral with a moh's hardness of 1, and composed of clay.

Sale

Clear rhombs showing double refraction.

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