Linarite on Barite Blanchard Mine Bingham Socorro County New Mexico

- Image ID: B064RN
Phil Degginger / Alamy Stock Photo
Image ID: B064RN
Linarite is a somewhat rare, crystalline mineral that is known among collectors for its unusually intense, pure blue color. It is formed by the oxidation of galena and chalcopyrite and other copper sulfides. It is a combined copper lead sulfate hydroxide with formula PbCuSO4(OH)2. Linarite occurs as monoclinic prismatic to tabular crystals and irregular masses. It is easily confused with azurite, but does not react with dilute hydrochloric acid as azurite does. It has a Mohs hardness of 2.5 and a specific gravity of 5.3 - 5.5.