red arsenic

red arsenic

[′red ′ärs·ən·ik]
(mineralogy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Lead requires only four periods of two hundred years each, to pass in succession from the state of lead, to the state of red arsenic, from red arsenic to tin, from tin to silver.