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moss agate

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noun

a kind of agate or chalcedony containing brown or black mosslike dendritic markings from various impurities.

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Origin of moss agate

First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for moss agate

moss agate

noun

a variety of chalcedony with dark greenish mossy markings, used as a gemstone
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
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