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Crichtonite

Type Locality
St Christophe-en-Oisans, Bourg d'Oisans, Isère, Rhône-Alpes, France
Mineral Data
(Sr,La,Ce,Y)(Ti,Fe3+,Mn)21O38
Strunz: 
4.CC.40
Physical Properties
Colour: 
Black
Streak: 
Dark grey
Hardness: 
5.0 - 6.0