Table 4

Multi-session average compositionsa of validation set spinels

Validation set
Sample namePS211PS212OC231350KLB8304MBR8313Vi314-58IO5650
n75763666706731
SiO2n.d.n.d.n.d.n.d.n.d.n.d.n.d.
TiO20.070(4)0.022(3)0.067(10)0.103(5)0.213(11)0.076(3)0.051(8)
Al2O332.8(8)37.4(10)50.9(16)60.7(12)49.1(10)59.2(12)56.3(12)
Cr2O335.8(4)32.0(4)17.1(6)6.17(6)17.13(16)8.54(6)13.35(11)
FeO*15.0(4)13.16(23)11.57(21)11.09(14)12.88(15)10.84(11)10.7(3)
MnO0.190(7)0.170(8)0.122(5)0.101(8)0.126(7)0.108(6)0.111(10)
MgO15.28(19)16.28(11)18.78(17)21.05(27)19.33(21)20.41(19)19.51(20)
CaO0.002(2)0.002(2)n.d.n.d.0.019(7)0.010(5)n.d.
Na2On.d.n.d.n.d.n.d.n.d.n.d.n.d.
NiO0.145(5)0.157(7)0.283(12)0.357(13)0.345(7)0.381(11)0.305(14)
  Total99.199.198.799.699.199.5100.2
Cr#0.423(6)0.365(7)0.184(7)0.064(1)0.190(4)0.088(2)0.137(3)
Fe3+/ΣFe (EPMA, corrected)0.133(12)0.079(15)0.12(2)0.24(3)0.28(2)0.16(2)0.04(3)
Fe3+/ΣFe (EPMA, uncorrected)0.111(31)0.054(29)0.08(5)0.19(6)0.25(5)0.12(6)0.00(7)
Fe3+/ΣFe (Möss.)b0.1310.0920.0940.220.290.140.054
  • Note: FeO* is total Fe calculated as FeO.

  • a Complete analyses can be found in Supplementary1 Table S1.

  • b Measurements from Wood and Virgo (1989), Bryndzia and Wood (1990), or Ionov and Wood (1992).