Astrophyllite

(K,Na)3(Fe,Mn)7Ti2Si8(O,OH)31

This sample of astrophyllite is displayed in the Smithsonian Museum of Natural History. Astrophyllite contains titanium and manganese. It has the composition (K,Na)3(Fe,Mn)7Ti2Si8(O,OH)31. It is about 6x8 cm across and is from Mont Saint-Hilaire, Quebec, Canada.

Mindat: Astrophyllite

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