Color is indigo blue. Luster is vitreous to pearly. Crystals are usually translucent to transparent. It is often intergrown with boleite in parallel growth. Crystals can be pseudocubic.
Cleavage is perfect.
Fracture is uneven. Streak is light green to blue. Associated Minerals include other rare copper and lead chlorides such as boleite , cumengite , chloroxiphite , paralaurionite , matlockite , chlorargyrite , atacamite , mendipite and diaboleite . Also found with cerussite , smithsonite , connellite , gerhardtite , cuprite , leadhillite , clays , linarite , phosgenite and chrysocolla . Notable Occurrences include Boleo, Santa Rosalia, Baja California, Mexico and the Mammoth District, Arizona , USA and most places where boleite is found.