greenstone

[green-stohn]

Origin of greenstone

First recorded in 1765–75; green + stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for greenstone

Historical Examples of greenstone


British Dictionary definitions for greenstone

greenstone

noun
  1. any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
  2. a variety of jade used in New Zealand for ornaments and tools
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

greenstone in Science

greenstone

[grēnstōn′]
  1. Any of various green metamorphic rocks formed from igneous rocks that have a relatively low silica content and owe their color to the presence of a green mineral such as chlorite, hornblende, or epidote.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.