eckermannite

A monoclinic mineral, Na3 (Mg,Fe)4 AlSi8 O22 (OH)2 ; amphibole group with Mg/(Mg + Fe2+ ) = 0.5 to 1.0 and Fe3+ /(Fe3+ + Al) = 0 to 0.5; fibrous; in nepheline syenites; an asbestos mineral.
Source: Dictionary of Mining, Mineral, and Related Terms











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