noun
definition
A weakly magnetic ferrous sulfide mineral, FeS.
Examples of pyrrhotite in a Sentence
Prospect, at the base of which there is a vein of pyrrhotite, with small quantities of nickel and copper.
Magnetic pyrites or pyrrhotite has a composition varying between Fe7S8 and Fe8S9, i.e.
In the Bay Complex narrow zones of bleached rock are rich in calcite, chlorite and pyrite and contain minor chalcopyrite and pyrrhotite.
Other minerals present include diopside, pargasite, spinel, phlogopite, apatite, graphite, pyrrhotite and zircon (Davidson 1943 ).
The sulfide minerals recorded from the lodes comprise pyrite, pyrrhotite, chalcopyrite, galena, sphalerite and arsenopyrite.
The copper deposits are mainly in well-marked fracture planes in serpentine; the ore is pyrrhotite, with or without chalcopyrite.
Newfoundland yields cupreous pyrites, worked at Pilley's Island, whilst the nickeliferous pyrites of Sudbury in Ontario is partly magnetic (see Pyrrhotite).