datolite

noun

dat·​o·​lite

ˈdatᵊlˌīt

plural -s

: a mineral Ca₂B₅SiO₉(OH)₅ consisting of a basic calcium borosilicate commonly occurring in glassy greenish crystals

Word History

Etymology

German datolith, from Greek dateisthai to divide + German -lith; from its granular structure

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!