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Petrichor: The smell after rainfall
a crystalline, water-insoluble, poisonous compound, HgS, occurring as a coarse, black powder
(black mercuric sulfide)
or as a fine, bright-scarlet powder
(red mercuric sulfide)
used chiefly as a pigment and as a source of the free metal.
Based on the Random House Dictionary, © Random House, Inc. 2017.
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