Table T3. Linear regression equations and correlation coefficients for X-ray diffraction peak area vs. measured weight percent in standard mineral mixtures.
|
Mineral
|
Regression
equation
|
Correlation
coefficient |
|---|---|---|
| Smectite | y = -0.55074 + 0.002472x | r = 0.90365 |
| Illite | y = 1.843 + 0.0063395x | r = 0.99359 |
| Chlorite + kaolinite | y = 5.3392 + 0.00074085x | r = 0.92298 |
| Quartz | y = 1.0578 + 0.00081873x | r = 0.95129 |
| Plagioclase | y = 1.3637 + 0.00092465x | r = 0.97934 |
| Calcite | y = -2.3974 + 0.0017734x | r = 0.98936 |
Note: y = peak area; x = weight percent.