LINDGRENITE

    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 from San Samuel Mine, Copiapó, Atacama, Chile © Andreas Schloth
Lindgrenite from Burro Mine, Colorado, USA © Alex Earl
Lindgrenite from Teniente Mine, Rancagua, Cachapoal, O'Higgins, Chile © Andreas Schloth
Lindgrenite from the Vaulry mines, Haute-Vienne, France © Jean-Marc Johannet

Lindgrenite in the World

Lindgrenite is found in the oxidation zone of the large Chilean copper porphyries (Chuquicamata, Tierra Amarilla), and American deposits in Arizona (Inspiration, Ray) and Idaho (Helena mine).

Lindgrenite in France

In France, lindgrenite is reported in Vaulry (Haute-Vienne) and Château-Lambert (Haute-Saône).

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

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