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Troilite
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 Fe(1-x)S (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.〔(【引用サイトリンク】publisher=npr.org )〕 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.
==Structure==
Troilite has hexagonal structure (Pearson symbol hP24, Space group P-62c No 190). Its unit cell is approximately a combination of two vertically stacked basic NiAs-type cells of pyrrhotite, where the top cell is diagonally shifted.〔 For this reason, troilite is sometimes called pyrrhotite-2C.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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