greenstone

[green-stohn]

noun

any of various altered basaltic rocks having a dark-green color caused by the presence of chlorite, epidote, etc.

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

As if to collect his thoughts, he had paused, looking away at Greenstone Ridge.
The Phantom Violin
Roy J. Snell
Her eyes were fixed upon the dark masses of Greenstone Ridge.
The Phantom Violin
Roy J. Snell
“Here we are on Greenstone Ridge,” the dark-eyed girl went on.
The Phantom Violin
Roy J. Snell
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
James Cowan

British Dictionary definitions for greenstone

greenstone

noun

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

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

[grēn′stōn′]

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.