Definition of "ferromagnesian" []

• Containing iron and magnesium. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Many of the latter are magnetite, while the others are hornblende and various ferromagnesian silicates."
• "This alteration consists of quartz veinlets, clays, sericite, pyrite, and iron-oxides replacing feldspar, ferromagnesian minerals and plagioclase."
• "Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures."