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ATHENA

MINERALOGY

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Mineral: HOWIEITE
Formula: Na(Fe2+,Mn)10(Fe3+,Al)2Si12O31(OH)13
Crystal System: Anorthic (Triclinic)
Group: Howieite group
IMA Number: 1964-017
References: CM 28 (1990), 855; HB2/1 (1995)
Type Locality: Laytonville quarry, Laytonville, Mendocino Co., California, USA

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