hilgardite

noun

hil·​gard·​ite

ˈhilˌgärˌdīt,

-gər-

plural -s

: a mineral Ca₈(B₆O₁₁)₃Cl₄.4H₂O consisting of hydrous chloride and borate of calcium occurring in colorless monoclinic domatic crystals

Word History

Etymology

Eugene W. Hilgard †1916 American geologist + English -ite

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