leucophanite
noun
leu·coph·a·nite
lüˈkäfəˌnīt
variants
or less commonly leucophane
ˈlükəˌfān
plural -s
: a mineral (Na, Ca)2BeSi2(O, F, OH)7 consisting of a beryllium sodium calcium silicate with fluorine occurring in glassy greenish tabular crystals
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Merriam-Webster unabridged
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