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

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!