[Physical properties]
Habit: tabular, massive, prismatic, stalactitic. Color: azure blue or very dark blue. Diaphaneity: transparent to translucent. Luster: vitreous (i.e., glassy). Streak: light blue. Cleavage: (011) perfect, (100) good. Fracture: conchoidal, brittle. Occurrence: secondary
mineral in the oxidized zone of copper ore deposits in association with malachite. |