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eckermannite

A monoclinic mineral, Na3(Mg,Fe)4AlSi8O22(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.

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  • ed.young
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