Crichtonite

minerals

anatase

chlorite

hematite

Formula: Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38
Multiple oxide, crichtonite group
Specific gravity: 4.46
Hardness: 5 to 6
Streak: Dark grey
Colour: Black
Weakly RADIOACTIVE
Environments

Hydrothermal environments

Crichtonite occurs in alpine-type fissure veins (Webmin).

Localities

At the type locality, Saint-Christophe-en-Oisans, Grenoble, Isère, Auvergne-Rhône-Alpes, France, crichtonite is associated with anatase, quartz, chlorite, hematite and feldspar (Dana).

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