from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A nonmagnetic variety of the mineral pyrrhotite, FeS, present in almost all meteorites and having almost no ferrous iron deficiency.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A non-magnetic variety of the ferrous sulfide mineral pyrrhotite that occurs in most meteorites
from the GNU version of the Collaborative International Dictionary of English
- n. Native iron protosulphide, FeS. It is known only in meteoric irons, and is usually in imbedded nodular masses of a bronze color.
from The Century Dictionary and Cyclopedia
- n. A native iron sulphid often occurring in meteorites, and especially meteoric irons, as embedded nodules or generally disseminated.
It is home to glasses, pyroxenes, feldspars, oxides, olivines, troilite and metals in its lunar soil, which is called regolith.
The best age for the Earth 4.54 Ga is based on old, presumed single-stage leads coupled with the Pb ratios in troilite from iron meteorites, specifically the Canyon Diablo meteorite.
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