pharmacosiderite
nounEtymology From Ancient Greek φάρμᾰκον (phármăkon, “poison (i.e. arsenic)”) + σῐ́δηρος (sĭ́dēros, “iron”) + -ite.
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Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences A hydrated basic ferric arsenate, consisting of the elements arsenic, iron, hydrogen, potassium, sodium and oxygen.