is a somewhat rare, crystalline mineral that is known among collectors for its unusually intense, pure blue color. It is formed by the oxidation
and other copper sulfides. It is a combined copper lead sulfate hydroxide
with formula PbCuSO4
. 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.
It was first identified in 1839 it is named after the Linares Plateau, Spain.