greensand

[ green-sand ]
/ ˈgrinˌsænd /

noun

a sandstone containing much glauconite, which gives it a greenish hue.

Origin of greensand

First recorded in 1790–1800; green + sand
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for greensand

greensand

/ (ˈɡriːnˌsænd) /

noun

an olive-green sandstone consisting mainly of quartz and glauconite
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