Specimens

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

Deep blue, massive, with nepheline; key feldspathoid.

White, fine, massive, opaque to slightly translucent.

White, fibrous, silky luster.

Pure, white, earthy “China clay”.

Black, high grade, foliated, greasy feel.

Amphibole group; black, coarse, massive.

Brown, earthy, massive; used for yellow pigment.

Bright metallic cubic cleavages; lead ore.

Deep purple crystal clusters.