Fassaite

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A sample of Fassaite
A sample of Fassaite

Fassaite is a variety of augite but having a very low iron content. It is named after the Fassa Valley, Italy. Some authorities do not recognize it as a separate mineral but continue to class it with Augite.

It is thought to be a contact mineral formed at high pressure on the interface between volcanic rocks and limestone.


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