aegirite

[ ey-guh-rahyt, ee-juh- ]

noun

1. a mineral, mainly sodium-ferric iron silicate, NaFe⋅(Si 2 O 6 ), occurring in feldspathoid rocks in slender prismatic crystals.

Word History and Origins

Origin of aegirite¹

First recorded in 1830–40; Aegir + -ite ²

Example Sentences

Being isomorphous with augite, crystals intermediate in composition between augite or diopside and aegirite are not uncommon, and these are known as aegirine-augite or aegirine-diopside.

From Project Gutenberg

Although exhibiting certain varietal differences, the essential identity of acmite and aegirite has long been established, but the latter and more recent name is pethaps in more general use, especially among petrologists.

From Project Gutenberg