milarite
noun
mi·lar·ite
ˈmēˌläˌrīt,
ˈmiləˌr-
plural -s
: a mineral K2Ca4Be4Al2Si24O62‧H2O consisting of a hydrous silicate of potassium, calcium, beryllium, and aluminum occurring in glassy hexagonal crystals
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Merriam-Webster unabridged
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