Transparent, colorless to pale-yellow, beryllium silicate with orthorhombic crystals.
Habit: well formed prismatic or tabullar hexagonal crystals, with pinacoidal {1010},
{0001}, or prism {1120} or pyramidal terminations.
Luster: vitreous (i.e., glassy).
Diaphaneity: translucent to transparent.
Color: colorless or pale yellow.
Streak: white.
Cleavage: [001] perfect, [110] distinct, [101] distinct.
Fracture: brittle.
Occurrence: commonly found in Be-bearing pegmatites and may be derived from the
alteration of beryl.
Beryllia, and beryllium chemicals
Confirmed carcinogen. Whenheated to decomposition it emits very toxic fumes of BeO.
