Lindgrenite - Encyclopedia
Class : Sulfates, chromates, molybdates
Subclass : Molybdates
Crystal system : Monoclinic
Chemistry : Cu3(MoO4)2(OH)2
Rarity : Very rare
Lindgrenite is an extremely rare copper molybdate from the oxidation zone of copper-molybdenum deposits where it is associated with a procession of secondary copper minerals (chrysocolla, brochantite, antlerite, etc...) and sometimes molybdenum (wulfenite). It was named in honor of the American geologist and Professor Waldemar Lindgren. It is a deep green to yellow-green mineral which forms tabular to lamellar crystals, rarely acicular, constantly striated, as well as small clusters.
Main photo : Lindgrenite from San Samuel Mine, Copiapó, Atacama, Chile © Stephan Wolfsried
Lindgrenite in the World
Twinning
No twin known for this mineral species.
Fakes and treatments
No fakes recorded for this mineral species.
Hardness : 4.5
Density : 4.2
Fracture : Micaceous
Streak : Pale green
TP : Transparent
RI : 1.930 to 2.020
Birefringence : 0.090
Optical character : Biaxial -
Pleochroism : Visible
Fluorescence : None
Solubility : Hydrochloric acid, nitric acid
Magnetism : NoneRadioactivity : None