Classroom Minerals

Brown, fluorescent crystals intergrown in dolomite rock.

White, fibrous, silky luster.

Cut black mica cleavage sheets.

Brown, earthy, massive; used for yellow pigment.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Clear, euhedral points and sections.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Dark brown to black; polycrystalline zinc ore.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Light pink, massive, crystalline, translucent.