Table 4

Normative mineralogy calculated using the CIPW method from bulk-chemical analysis

MineralSanC-ASanC-BSanC-CSanC-FSanC-ISanC-JSanC-K
Feldspar38.92 (32)36.99 (24)29.01 (29)33.2941.9226.29 (31)36.31
Orthoclase14.25 (0)7.50 (8.5)15.55 (3.5)9.108.2217.38 (0)8.05
Nepheline5.24 (12)11.69 (12)10.28 (12)12.857.0613.53 (23)11.47
Leucite0.00 (10)0.00 (10)0.00 (7)0.000.000.00 (0)0.00
Hi-Ca pyroxene10.50 (19)16.19 (18)14.81 (22)16.4313.4615.46 (21)16.24
Olivine17.17 (12)14.61 (10)17.06 (11)15.1115.7714.00 (13)14.72
Ilmenite5.47 (0)5.32 (1.5)5.22 (0)5.225.305.11 (0)5.22
Magnetite6.08 (7)5.70 (7.5)5.86 (10)5.765.925.84 (13)5.70
Hematite0.00 (4)0.00 (5)0.00 (5)0.000.000.00 (2)0.00
  Total99.5599.8299.7399.7699.8299.7799.81
  • Notes: Modal mineralogy (in parentheses) calculated by combining averages of measured mineral compositions from microprobe spot analyses and phase proportions from Rietveld refinement of bulk-compositional XRD data.