Specimens

Amphibole group; black, coarse, massive.

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

Deep blue, massive, with nepheline; key feldspathoid.

Black, high grade, foliated, greasy feel.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Black, Micaceous, glittery metallic.

Brown, earthy, massive; used for yellow pigment.

White, fine, massive, opaque to slightly translucent.

Pure, white, earthy “China clay”.

Clear, pure cleavages, Mohs’ hardness of 2.