1. Quizzes & Games
  2. Word of the Day
  3. Video
  4. New Words
 

aegirine


aegirine

/

Aegirine crystals from Magnet Cove, Arkansas—Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard

Pyroxene mineral, sodium and iron silicate (NaFe+3SiO), commonly found in alkaline igneous rocks, particularly in syenites (composed of an alkali feldspar and a ferromagnesian mineral) and syenite pegmatites. It also occurs in schists. Aegirine is generally dark green to greenish black.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on aegirine, visit Britannica.com.

Learn More About

Seen & Heard

What made you look up aegirine? Please tell us what you were reading, watching or discussing that led you here.

Test Your Vocabulary

Take Our 10-Question Quiz

#6: Flabbergast
: to overwhelm with shock,
surprise, or wonder
See All Top 25 Entries »
Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
iPhone | iPad | Android | More
Join Us on FB & Twitter
Get the Word of the Day and More
Facebook | Twitter