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@ GeoWriter: Why is troilite not a member of the Nickeline group? Eric Kvaalen ( talk) 14:47, 17 November 2016 (UTC) reply

I don't know the reason, but I think it may perhaps be because the space group of troilite (P 62c) is not the same as the space group of the minerals of the nickeline group (P 6₃/mmc). GeoWriter ( talk) 16:54, 17 November 2016 (UTC) reply

It's nearly universal for pages to have separate articles for the mineral and the chemical. For example, aluminum oxide and corrundum, mercury sulfide and cinnabar, lead(II) oxide and litharge, etc. Seems natural for nickel arsenide and nickeline to have separate pages too. 〈  Forbes₇₂ |  Talk 〉 01:27, 21 January 2022 (UTC) reply

Agreed, that is the common convention. -- Kent G. Budge ( talk) 05:32, 21 January 2022 (UTC) reply