CHEMISTRY - Cu3(PO4)(OH)3
CRYSTALLOGRAPHY - Orthorhombic
CRYSTAL GROWTH AND HABITS - Cornetite forms short, rounded prismatic crystals; also small radial aggregates and crusts.
COLOR AND OPTICAL PROPERTIES - Bright blue to greenish blue. Transparent to translucent.
HARDNESS - 4.5
SPECIFIC GRAVITY - 4.1
LUSTER - Vitreous
STREAK - Blue
BREAKABILITY - Still researching this one.
OCCURRENCE - Cornetite is a rare secondary mineral found in the oxidized zone of hydrothermal copper deposits.
ASSOCIATED MINERALS - Copper, Brochantite, Libethenite, Malachite, Atacamite, Chrysocolla.
MINERAL NAME - In honor of Jules Cornet a Belgian geologist.