- Lollingite
Lollingite, also known as löllingite is an
iron arsenide mineral with formula FeAs2. It is often found associated witharsenopyrite (FeAsS) from which it is hard to distinguish.Cobalt ,nickel andsulfur substitute in the structure. Theorthorhombic lollingite group includes thenickel iron arseniderammelsbergite and the cobalt iron arsenidesafflorite .It forms opaque silvery white
orthorhombic prismatic crystals often exhibitingcrystal twinning . It also occurs in anhedral masses and tarnishes on exposure to air. It has aMohs hardness of 5.5 to 6 and a quite highspecific gravity of 7.1 to 7.5. It becomes magnetic after heating.Lollingite was first described in 1845 at the Lölling district in Carinthia,
Austria . It is known by a number of synonyms including leucopyrite.References
* [http://www.mindat.org/min-2426.html Mindat]
* [http://webmineral.com/data/Lollingite.shtml Webmineral]
* [http://mineral.galleries.com/minerals/sulfides/lollingi/lollingi.htm Mineral galleries]
* [http://simplethinking.com/palache/lollingite.stm Minerals of Franklin, N.J.]
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