Specimens

Deep blue, massive, with nepheline; key feldspathoid.

Amphibole group; black, coarse, massive.

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

Sale

Clear, pure cleavages, Mohs’ hardness of 2.

Pure, white, earthy “China clay”.

White, fine, massive, opaque to slightly translucent.

Black, high grade, foliated, greasy feel.

Brown, fluorescent crystals intergrown in dolomite rock.

White, fibrous, silky luster.

Brown, earthy, massive; used for yellow pigment.