Based on safety concerns, a crude guide would be to start with naturally occurring compounds. Examples: H2, N2, O2, He, Ar, NaCl, NaI, KCl, NaBr,
MgCl2, Na2B4O7.10H2O, HgS, PbS, C, S, CaF2, ZnS, K2(UO2)2(VO4)2ยท3H2O, Au, CuFeS2,(Fe,Mn)WO4, SrSO4, (Ce,La)PO4, ...
[Edited on 29-3-2014 by AJKOER]
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