greensand

[green-sand]

green·sand

[green-sand]
noun
a sandstone containing much glauconite, which gives it a greenish hue.

Origin:
1790–1800; green + sand
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Greensand is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
greensand (ˈɡriːnˌsænd)
 
n
an olive-green sandstone consisting mainly of quartz and glauconite

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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