Bergalite

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A pitchy black dike rock containing small phenocrysts of haueyne, apatite, perovskite, melilite, and magnetite in a groundmass of the same minerals with nepheline, biotite, and brown interstitial glass; from Kaiserstuhl, Oberbergen, Baden, Germany. Syn: bergalith

Source: Dictionary of Mining, Mineral, and Related Terms


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