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A monoclinic mineral, Na2 Ca(MgFe+2 )5 Si8 O
22 (OH)2 ; amphibole group with Mg/(Mg+Fe2+ ) = 0 to
0.49 and Fe3+ /(Fe3+ +Al) = 0.7 to 1.0; forms a series
with magnesioriebeckite; fibrous; in soda-rich rhyolites, granites, and
pegmatites; crocidolite variety is blue asbestos, tiger eye is crocidolite
replaced by quartz. CF: glaucophane
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