Crichtonite

crichtonite

anatase

chlorite

hematite

Images

Formula: Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈
Multiple oxide, crichtonite group, strontium-, manganese-, yttrium-, titanium-, chromium- and vanadium- bearing mineral
Crystal System: Trigonal
Specific gravity: 4.46 measured, 4.55 calculated
Hardness: 5 to 6
Streak: Dark grey
Colour: Black
Weakly RADIOACTIVE
Environments

Hydrothermal environments

Crichtonite occurs in alpine-type fissure veins associated with quartz and chlorite (HOM).

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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