Hummerite - Encyclopedia

    Class : Oxides and hydroxides
    Subclass : Hydroxides and hydrates
    Crystal system : Triclinic
    Chemistry : KMgV5O14 8H2O
    Rarity : Rare to very rare


Hummerite is a rare hydrated oxide of vanadium, potassium and magnesium. It is a secondary mineral deriving from the dissolution of primary vanadium minerals. It is found in the oxidation zone of areas containing vanadium, often uranium deposits. It owes its name to its location of discovery : the Hummer mine (Colorado). Hummerite is only known in orange-colored plating, veinlets and efflorescences.

Main photo : Hummerite from Hummer Mine, Paradox Valley, Colorado, USA © Rob Lavinsky

Hummerite from Hummer Mine, Paradox Valley, Colorado, USA © Gianfranco Ciccolini
Hummerite from Hummer Mine, Paradox Valley, Colorado, USA © Joy Desor
Hummerite from North Mesa Mine, Utah, USA © Joy Desor
Hummerite from Gold Quarry Mine, Nevada, USA © Stephan Wolfsried

Hummerite in the World

Hummerite forms orange platings on sandstones of the uranium districts of Paradox Valley (Colorado) and Grants (New Mexico). It is also known from the Gold Quarry gold deposit (Nevada) and Malargüe (Mendoza, Argentina).

Hummerite in France

Hummerite is not known in the French underground.

Twinning

No twin known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.



Hardness : Undetermined
Density : 2.53
Fracture : Undetermined
Streak : Yellow


TP : Translucent
RI : -
Birefringence : -
Optical character : Biaxial -
Pleochroism : None
Fluorescence : None


Solubility : Water

Magnetism : NoneRadioactivity : None

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