acmite

[ak-mahyt]

noun

a rare pyroxene mineral, sodium-ferric iron silicate, NaFe(Si2O6), found in feldspathoid rocks.

Origin of acmite

1830–40; < Greek akm(ḗ) sharp point + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019