Deep blue Linarite crystals on a
matrix of Quartz from the Grand Reef Mine, Arizona
CHEMISTRY PbCu(SO4)(OH)2 Lead copper sulfate
CRYSTALLOGRAPHY Monoclinic
CRYSTAL GROWTH AND HABITS Linarite normally forms elongate prismatic crystals but can also be tabular or can be found as crusts.
COLOR AND OTHER OPTICAL PROPERTIES Blue to deep blue
HARDNESS 2.5
SPECIFIC GRAVITY 5.3-5.4
LUSTER Vitreous to adamantine
STREAK Blue
BREAKABILITY 1 very good direction of cleavage and 1 fair direction, fracture is conchoidal
OCCURRENCE Linarite is a secondary mineral in lead-copper sulfide deposits.
ASSOCIATED MINERALS Cerussite, Galena, Malachite, Anglesite, Leadhillite, Chrysocolla