SEASON TYPE: summer, spring, autumn 

 

Composition: Calcium oxide + Magnesium oxide + Manganese oxide + Iron oxide + Silicon dioxide, Manganese Silicate.

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Origin: Spain, Sweden, Germany, Mexico, Brazil, United States, Russia, South Africa, Australia, Canada, Finland, Japan, Madagascar, Mexico, Tanzania, India.

 

The hardness on the Mohs 5.5 - 6.

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