danalite
noun
da·na·lite
ˈdānəˌlīt
plural -s
: a mineral (Fe,Zn,Mn)8Be8Si6O24S2 that consists of a reddish or gray silicate and sulfide of iron and beryllium usually containing also zinc and manganese and that is isomorphous with helvite and genthelvite
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Merriam-Webster unabridged
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