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Boleite
Boleite is a rare halide mineral, with an unique blue color and a box - like shape, extracted from sedimentary deposits of copper, Boleite is a scarce, difficult to find mineral specimen

Physical Characteristics

 

Boleite from Mexico
Color: Deep prusian blue to light indigo blue
Luster: Vitreous, pearly
Transparency: Commonly translucent, some exceptional specimens are transparent
Crystal System: Tetragonal
Habits: Cubic crystals up to 2 cm. Always twinned, often found without any matrix
Fracture: Conchoideal and brittle
Cleavage: Perfect in one direction
Hardness: 3 - 3.5
Specific Gravity: 5
Streak: Blue with a light greenish tint
Other: Inert in water, soluble in HN03
Occurrence: Mexico (Baja California), USA, Australia