greensand

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green·sand

 (grēn′sănd′)
n.
A sand or sediment having a dark greenish color caused by the presence of glauconite.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

greensand

(ˈɡriːnˌsænd)
n
(Geological Science) an olive-green sandstone consisting mainly of quartz and glauconite
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

green•sand

(ˈgrinˌsænd)

n.
a sandstone containing much glauconite, which gives it a greenish hue.
[1790–1800]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.greensand - an olive-green sandstone containing glauconite
sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
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References in periodicals archive ?
Contemporary methods for the removal of iron, manganese, and hydrogen sulphides are mainly based on catalytic filter materials containing Mn[O.sub.2] (Birm, manganese greensand, Filox, Pyrolox, Everzit Mn, and others).
It does not need chemical regeneration with a solution of potassium permanganate like Birm, Filox, and Manganese Greensand, but only mechanical backwash at a rate of 60-70 m/h in 24 h, and dosing of a relatively small amount of active chlorine (0.1-1.0 mg/L) at the inlet of the filter to keep the medium active.
GreensandPlus is an enhanced version of the Inversand's Manganese Greensand. The Manganese Greensand filtration process efficiently and economically removes iron, manganese, arsenic, radium, and hydrogen sulfide in municipal, industrial, point-of-use, and many other applications.
Because the levels of iron and manganese in their water supplies were moderate, the 10 WTPs, for which Dufresne-Henry recently provided design and construction services, all use manganese greensand technology.
Conventional technologies that have previously been used to treat groundwater, such as manganese greensand, could simply not be used without processes that could remove organics and microorganisms from the water.