The Collaborative International Dictionary
Troilite \Tro"i*lite\, n. [Named after Dominico Troili, an Italian of the 18th century.] (Min.) Native iron protosulphide, FeS. It is known only in meteoric irons, and is usually in imbedded nodular masses of a bronze color.
Wiktionary
n. (context mineralogy English) A non-magnetic variety of the ferrous sulfide mineral pyrrhotite that occurs in most meteorites
Wikipedia
Troilite is a rare iron sulfide mineral with the simple formula of FeS. It is the iron rich endmember of the pyrrhotite group. Pyrrhotite has the formula FeS (x = 0 to 0.2) which is iron deficient. As troilite lacks the iron deficiency which gives pyrrhotite its characteristic magnetism, troilite is non-magnetic.
Troilite can be found as a native mineral on Earth, but is more abundant in meteorites, in particular those originating from the Moon and Mars. It is among the minerals found in samples of the meteorite that struck Russia on February 15th, 2013. Uniform presence of troilite on the Moon and possibly on Mars has been confirmed by the Apollo, Viking and Phobos space probes. The relative intensities of isotopes of sulfur are rather constant in meteorites as compared to the Earth minerals, and therefore troilite from Canyon Diablo meteorite is chosen as the international sulfur isotope ratio standard.
Usage examples of "troilite".
The sides of the short hall had been polished smooth and etched with acid by the Stoners to reveal the beautiful triangular Widmanstiitten patterns, veined with rocky troilite intrusions.
In fact, locked up in Cruithne there were also troilite, olivine, pyroxene, and feldspar—minerals that could also serve as sources of ferrous metals when the nickel-iron was exhausted, even if their extraction was a little more complex.
In fact, locked up in Cruithne there were also troilite, olivine, pyroxene, and feldspar -- minerals that could also serve as sources of ferrous metals when the nickel-iron was exhausted, even if their extraction was a little more complex.