sheridanite

noun

sher·​i·​dan·​ite

ˈsherədᵊnˌīt

plural -s

: a mineral (Mg₉Al₃)(Al₃Si₅)O₂₀(OH)₁₆ of the chlorite group consisting of pale greenish colorless basic silicate of magnesium and aluminum

Word History

Etymology

Sheridan county, Wyoming, its locality + 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!