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Table T6. Characteristic X-ray diffraction peaks for semiquantitative analysis of composite clay minerals, quartz, cristobalite, plagioclase feldspar, and calcite.
|
Mineral
|
Reflection
|
d-Value
(Å)
|
Peak position
(°2θ)
|
|
Composite clay
|
Multiple
|
4.478
|
19.4–20.4 (area)
|
|
Quartz
|
100
|
4.257
|
20.9 (max. intensity)
|
|
Quartz
|
101
|
3.342
|
26.3–27.0 (area)
|
|
Plagioclase
|
2
|
3.192
|
27.4–28.2 (area)
|
|
Calcite
|
104
|
3.035
|
29.1–29.7 (area)
|
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