ralstonite

noun

ral·​ston·​ite

ˈrȯlztəˌnīt,

-lst-

plural -s

: a mineral NaMgAl₅F₁₂(OH)₆.3H₂O consisting of a hydrous basic fluoride of aluminum, sodium, and magnesium in octahedral crystals

Word History

Etymology

J. Grier Ralston, 19th century American clergyman + English -ite

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