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Table T1. X-ray diffraction analysis of standard mixtures of kaolinite and chlorite.

Mixture Actual abundance
(wt%)		 Peak intensity
(counts/step)		 Fitted peak
(total count)		 Doubled half-peak and composite peak area
(total count)		 Calculated kaolinite abundances and errors
(wt%)
Kaolinite Chlorite Kaolinite
(002)		 Chlorite
(004)		 Kaolinite
(002)		 Chlorite
(004)		 Kaolinite
(002)		 Chlorite
(004)		 Kaolinite (002) +
chlorite (004)		 Intensity
ratio		 Error-
intensity ratio		 Fitted-area
ratio		 Error-fitted
area ratio		 Doubled half-
peak area		 Error–half-
peak area
C-1 91.3 8.7 6,515 1,682 225,627 31,479 127,691 NA 256,933 79.5 11.8 87.8 3.5 99.0 7.7
C-2 82.3 17.7 3,215 1,220 110,471 24,640 62,721 NA 135,634 72.5 9.8 81.8 0.6 88.2 5.8
C-3 73.1 26.9 1,870 1,057 63,138 21,927 35,892 17,663 86,096 63.9 9.2 74.2 1.1 74.6 1.5
C-4 63.6 36.4 1,379 952 47,991 21,213 27,800 18,009 70,457 59.2 4.4 69.3 5.7 68.3 4.7
C-5 53.8 46.2 1,182 1,122 39,371 25,531 23,670 19,264 65,868 51.3 2.5 60.7 6.9 58.7 4.9
C-6 43.7 56.3 577 766 18,730 18,531 11,262 12,259 37,766 43.0 0.7 50.3 6.6 43.4 0.3
C-7 33.3 66.7 467 849 13,643 20,969 8,598 13,289 34,942 35.5 2.2 39.4 6.1 31.9 1.4
C-8 22.6 77.4 223 607 5,485 16,615 NA 9,332 21,961 26.9 4.3 24.8 2.3 20.8 1.8
C-9 11.5 88.5 496 1,761 8,782 54,812 NA 29,134 63,600 22.0 10.5 13.8 2.4 11.8 0.3
K-0 0.0 100.0 69 640 1,673 15,958 NA 8,855 17,143 9.7 9.7 9.5 9.5 –4.8 4.8
K-05 5.9 94.1 107 676 2,713 17,159 NA 9,367 19,723 13.7 7.8 13.7 7.8 7.1 1.2
K-1 11.7 88.3 183 811 4,411 22,114 NA 12,329 26,786 18.4 6.7 16.6 4.9 11.2 0.5
K-2 22.9 77.1 402 868 9,908 27,539 NA 15,310 37,204 31.7 8.7 26.5 3.5 24.4 1.4
K-3 33.8 66.2 551 1,039 16,064 25,867 10,638 16,084 42,769 34.7 0.9 38.3 4.5 32.4 1.4
K-4 44.2 55.8 737 930 23,765 23,039 14,846 16,401 47,516 44.2 0.0 50.8 6.5 46.8 2.6
K-5 54.3 45.7 1,063 1,037 36,160 23,057 20,057 17,279 59,999 50.6 3.7 61.1 6.7 52.2 2.1
K-6 64.1 35.9 1,487 1,065 51,487 24,232 28,895 18,484 76,850 58.3 5.8 68.0 3.9 63.1 1.0
K-7 73.5 26.5 1,620 870 53,500 23,317 30,854 15,270 76,814 65.1 8.5 69.6 3.9 70.2 3.3
K-8 82.6 17.4 2,914 1,106 102,934 22,973 53,545 NA 126,280 72.5 10.2 81.8 0.9 76.7 6.0
K-9 91.5 8.5 6,200 1,731 220,796 34,478 122,081 NA 255,051 78.2 13.3 86.5 5.0 93.2 1.7
K-95 95.8 4.2 5,714 1,358 203,069 25,808 110,104 NA 229,221 80.8 15.0 88.7 7.0 93.7 2.0
K-10 100.0 0.0 7,270 1,552 259,775 36,568 147,478 NA 295,334 82.4 17.6 87.7 12.3 99.8 0.2
Average: 7.4   5.1   2.6

NA = Not applicable.

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