- any of various altered basaltic rocks having a dark-green color caused by the presence of chlorite, epidote, etc.
Origin of greenstone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for greenstone
As if to collect his thoughts, he had paused, looking away at Greenstone Ridge.
Her eyes were fixed upon the dark masses of Greenstone Ridge.
“Here we are on Greenstone Ridge,” the dark-eyed girl went on.
Which being really built of greenstone the story must be true!An Unsentimental Journey through Cornwall
Dinah Maria Craik
Then there arose a dispute about the ownership of a tangiwai (greenstone pendant).The adventures of Kimble Bent
- any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
- a variety of jade used in New Zealand for ornaments and tools
- 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.