Without Reserve Star Sillimanite Orissa IndiaA fascinating collector's stone sillimanite an aluminium silicate mineral is a polymorph with two other minerals

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Description

Without Reserve Star Sillimanite Orissa IndiaA fascinating collector's stone sillimanite an aluminium silicate mineral is a polymorph with two other minerals: kyanite and andalusite. A polymorph is a mineral that shares the same chemistry but has a different crystal structure with another or other minerals. It is rare to see...

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