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礦物之美－（硬硼鈣石－COLEMANITE）
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COLEMANITE Ca2B6O11·5H2O (monoclinic) . Boron, Kern County, California . 晶体外觀作短柱狀，無色至淡黃色，硬度 4.5，玻璃光澤，發生乾早，水系不發達∼playa lakes 的硼砂礦床 裏．為硼砂的重要來源．COLEMANITE一字用來紀念專門販賣硬硼鈣石的美 國舊金山商人William T.Coleman .常見與 calcite, celestite, borax, ulexite, kernite, hydroboracite and other borate minerals 共生. 著名產地∼Yermo, Boron, Death Valley
and other California localities, USA; Nevada, USA; Chile and Panderma,
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