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  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.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fassaite". A list of authors is available in Wikipedia.
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