Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:HOWIEITE
Formula:Na(Fe2+,Mn)10(Fe3+,Al)2Si12O31(OH)13
Crystal System:Anorthic (Triclinic)
Strunz Nr:8/F.16-20
Group:Howieite Group
References:CM 28 (1990), 855; HB2/1 (1995)
Type Locality:Laytonville quarry, Laytonville, Mendocino Co., California, USA

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