penroseite

noun

pen·​rose·​ite

ˈpenˌrōˌzīt

plural -s

: a mineral (Ni,Cu,Pb)Se₂ structurally like pyrite consisting of a selenide of lead, copper, and nickel and occurring in lead gray radiating columnar masses (hardness 3, specific gravity 6.9)

Word History

Etymology

Richard A. F. Penrose †1931 American geologist + 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!