— pyritic /puy rit"ik, peuh-/ , pyritical, pyritous /peuh ruy"teuhs, puy-/ , adj.
/puy"ruyt/ , n.
a very common brass-yellow mineral, iron disulfide, FeS 2 , with a metallic luster, burned to sulfur dioxide in the manufacture of sulfuric acid: chemically similar to marcasite, but crystallizing in the isometric system.
Also, pyrites . Also called iron pyrites .
[ 1560-70; pyrites pyrítes, n. use of adj.: of fire, so called because it produces sparks when struck. See PYR-, -ITE 1 ]