L: vitreous; pearly on cleavages. Cr Habits: flat and bladed, compact groupings, tall prismatic and short, stubby, tabular ... H: 7-7.5 C: 3,2 F: conchoidal to uneven L: vitreous; black and brown may be dull Cr Habits: elongated or stubby, prismatic ... L: vitreous. Cr Habits: well formed crystals, similar to orthoclase (twinning habits), grainy and in compact crystal aggregates ... L: vitreous, pearly. Cr Habits: well shaped prismatic and tabular crystals, which are sometimes striated; penetration and ...