It would be fascinating to compare the crystals of berlinite to those of quartz. Color is colorless, gray to pink or rose. Luster is vitreous. Crystals are transparent to translucent. Cleavage is absent.
Fracture is conchoidal.
Streak is white or gray. Notable Occurrences include the Vestana iron mine, Nastum, Sweden. Best Field Indicators are locality, color, absence of cleavage and hardness.