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The H2S reacted with iron in the basalt to make pyrites, so if exhaust gas were sequestered routinely, scrubbing might not be needed.

Some of the others brought glistening stones, and among them, apparently pyrites, which very commonly accompanies gold, but of the precious metal itself Raleigh could hardly boast a speck in truth.

The ore being now carefully examined proved worthless pyrites; and the Arctic gold mines seem to have proved a “fizzle” as great as any of the worst which have succeeded them.

An earth abounding in pyrites, used by the ancients to kill insects, etc., on vines; Ð applied by Brongniart to a carbonaceous alum schist.

The rock near here is greenstone, in which are many veins of pyrites.