STUDTITE

    Class : Oxides and hydroxides
    Subclass : Uranyl hydroxides
    Crystal system : Monoclinic
    Chemistry : UO4 4H2O
    Rarity : Very rare

Studtite is an extremely rare uranium hydroxide. It is found in the oxidation zone of uranium deposits, preferentially associated with becquerelite and billietite. By dehydration, it can be transformed into an even rarer uranium hydroxide : metastudtite. It was named in honor of the Belgian geologist Franz Edward Studt who established the geological map of Katanga. Studtite occurs in sea urchins of millimeter-sized acicular crystals that are canary yellow to pale yellow.

Main photo : Studtite from Shinkolobwe, Kantanga, Democratic Republic of Congo © Italo Campostrini

Strontianite from Oberdorf, Styrie, Austria © Anton Watzl
Green strontianite from Strontian, Scotland, UK © Rock Currier
Strontianite from Teliatko serpentinites, Slovakia © Martin Stevko
Strontianite from Drôme septarias, France © Enrico Bonacina

Studtite in the World

Studtite is known from relatively few deposits worldwide. Its best specimens come from Shinkolobwe and Kobokobo (Katanga, Democratic Republic of Congo), it is also reported at Musonoï (Kolwezi). It is also known at the Clara mine, on the Krunkelbach uranium deposit and in several other German deposits.

Strontianite in France

In France, studtite is known at Rabejac (Hérault) and in the small Davignac vein near Meymac (Corrèze) as well as at the Bel Air mine and at the Commanderie (Deux-Sèvres) and at the Prévinquières mine (Aveyron).

Twinning

No twinning known for this mineral species.

Fakes and treatments

No fakes listed for this mineral species.


Hardness : Undetermined
Density : 3.58
Fracture : Undetermined
Streak : Undetermined

TP : Translucent to transparent
RI : 1.537 to 1.690
Birefringence : 0.143
Optical character : Biaxial +
Pleochroism : None
Fluorescence : None

Solubility : -

Magnetism : NoneRadioactivity : Very strong

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