a hard, green, brittle, crystalline mineral, Cu6Si6O18·6H2O, hydrous copper silicate, used in making jewelry
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.