LAWSONITE CaAl2Si2O7(OH)2·H2O (orthorhombic) . White crystals with green muscovite . Reed Ranch, Tiburon Peninsula, Marin County, California 硬柱石晶體常呈柱狀，板狀或粒狀．無色，白色，粉紅色．玻璃光澤．硬度６ ，形成於片岩或片麻岩中．

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NO.457