greensand

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

Origin:
1790–1800; green + sand

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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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Example sentences
The results obtained from this study will be useful to greensand foundries looking to reduce volatile hydrocarbon emissions.
The principle of course to fine filtration also applies to the greensand filter.
Greensand filters can also be configured as pressure filters for the removal or
  arsenic.
Pressure drop is comparable to that experienced with a greensand filter.
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