On Loellingite (FeAs2).
2, 3, 4
Four new localities for loellingite, one British and three Norwegian are given.
A chemical analysis of the loellingite from Drag, North Norway, is presented.
The powder patterns indicate minor differences in the lattitces of the loellingites from different localities. Based on patterns of naturally occurring minerals and a few syntheses, it seems possible to explain the pattern differences by a varying content of sulphur substituting for arsenic in the crystal structure. Similar differences are also noted in the arsenopyrite group.