eck·er·mann·ite
| \ ˈekə(r)məˌnīt \
plural -s
Definition of eckermannite
: a mineral Na3(Mg,Li)4(Al,Fe)Si8O22(OH,F)2 consisting of an amphibole containing magnesium, lithium, iron, and some fluorine
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Merriam-Webster unabridged
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