METASTUDTITE

    Class : Oxides and hydroxides
    Subclass : Uranyl hydroxides
    Crystal system : Orthorhombic
    Chemistry : UO4 2H2O
    Rarity : Very rare

Metastudtite is an ultra-rare hydrated uranium oxide, resulting from the partial dehydration of studtite. It is found in the oxidation zone of uranium deposits. Its name comes from the Greek meta (after) and studtite. Metastudtite appears in acicular crystals or elongated tablets of 3 mm or less, canary yellow to greenish yellow.

Main photo : Metastudtite from Shinkolobwe Mine, Haut-Katanga, Democratic Republic of Congo © Chuck Adan

Metastudtite in the World

Metastudite is only known from very rare uranium deposits. It is found in particular at Shinkolobwe (Katanga, Democratic Republic of Congo), its type locality, which undoubtedly produced the best crystals. However, it has also been reported in Daweb (Namibia), Eivollen and Narvik (Norway), Cordoba (Spain) and Gray Daun Mine (Utah).

Right photo : Metacinnabar of Róka Hill, Budapest, Hungary © Laszlo Toth


Metastudtite in France

Metastudtite is not present in the French underground.

Twinning

No twin known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.


Hardness : 4
Density : 4.67
Fracture : Fibrous
Streak : Yellow

TP : Translucent to transparent
RI : 1.640 to 1.760
Birefringence : 0.120
Optical character : Biaxial +
Pleochroism : None
Fluorescence : None

Solubility : Hydrochloric acid

Magnetism : NoneRadioactivity : Very strong

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