Mineral Identification Table Minerals for This Lab and Some Physical Properties They Possess. ... Biotite1 (K, Mg, Fe, Al Silicate) Luster nonmetallic. Color dark green, brown, or black. Hardness Platy cleavage (sheets). Streak white to gray. Schist, gneiss, ... colored granite*. Variety of industrial uses. Olivine (Mg, Fe)2SiO4 Luster ...