Fracture is uneven and brittle. Streak is light greenish-blue. Notches or interpenetrant angles can be seen in some specimens revealing their true twinned nature. Associated Minerals include other rare copper and lead chlorides such as pseudoboleite , cumengite , chloroxiphite , paralaurionite , matlockite , chlorargyrite , bideauxite , atacamite , mendipite and diaboleite . Also found with cerussite , smithsonite , leadhillite , linarite , phosgenite and chrysocolla .
Boleite crystals are often loose, but some are found in a clay matrix.
Best Field Indicators are crystal habit, color, density, streak and locality. 1995,1996,1999 by Amethyst Galleries, Inc.