pyrites /pī- or pi-rīˈtēz/

1. A brassy yellow mineral, iron disulphide, crystallizing in the cubic system, occurring in octahedra, pyritohedra, etc (also called pyrite /pīˈrīt/, iron pyrīˈtēs, fool's gold)
2. Extended to a large class of mineral sulphides and arsenides

pyritic /pir-itˈik or pīr-itˈik/ or pyritˈical adjective

pyritifˈerous adjective

pyrˈitize or pyrˈitise transitive verb

To convert into, or replace by, pyrites

pyritohēˈdral adjective

pyritohēˈdron noun (pl pyritohēˈdra)

A pentagonal dodecahedron

pyrˈitous adjective

arsenical pyrites

Mispickel

cockscomb pyrites or spear pyrites

A twinned form of marcasite

copper pyrites

Sulphide of copper and iron, chalcopyrite, a mineral very similar to iron pyrites

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