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Reference.org
Colemanite
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<p>Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in <a href="/facts/Evaporite/vNW8fcEy">evaporite</a> <a href="/facts/Deposition_(geology)/qxjlY8KL">deposits</a> of alkaline <a href="/facts/Lake/YP0xxn0E">lacustrine</a> environments. Colemanite is a secondary mineral that forms by alteration of <a href="/facts/Borax/IQrXRJ3N">borax</a> and <a href="/facts/Ulexite/bejMrcy6">ulexite</a>. </p><p>It was first described in 1884 for an occurrence near <a href="/facts/Furnace_Creek%2c_California/9rv9lG6t">Furnace Creek</a> in <a href="/facts/Death_Valley/VLvcwx4t">Death Valley</a> and was named after <a href="/facts/William_Tell_Coleman/K2sGxclF">William Tell Coleman</a> (1824–1893), owner of the mine "Harmony Borax Works" where it was first found. At the time, Coleman had alternatively proposed the name "smithite" instead after his business associate <a href="/facts/Francis_Marion_Smith/fT3veVeU">Francis Marion Smith</a>. </p>