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Ferro-winchite

About
Group Parent: 
Mineral Data
[CaNa][(Fe2+)4(Al,Fe3+)][(OH)2|(Si8O22]
Strunz: 
9.DE.20
Physical Properties
Colour: 
Cobalt-blue to violet-blue
Crystal System: 
Monoclinic
Streak: 
Pale blue-grey.
Hardness: 
5.5 -