If the mass is almost entirely either arsenopyrite or loellingite then it is possible to distinguish on the basis of the density since arsenopyrite has

Detailed description properties and locality information guide about the mineral loellingite or lollingite

Loellingite also spelled löllingite is an iron arsenide mineral with formula FeAs2 It is often found associated with arsenopyrite FeAsS from which it is hard to

Lollingite or as it is alternatively spelled loellingite is an uncommon mineral but is found with other arsenides and thus it is included with them when mined for

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