Table
T2. Positions of diagnostic peaks used for the identification of
minerals in X-ray diffractograms and for quantification of peak intensities.
Note: Opal A shows a very broad peak around 4 Å.
Mineral
Peak
(2
)Peak
(Å)
Quartz
26.65
3.34
K-Feldspar
26.93-27.52
3.31-3.24
Plagioclase
27.77-28.13
3.21-3.17
Hornblende
10.30-10.70
8.59-8.27
Calcite
29.45
3.03
Dolomite
30.94
2.89
Pyrite
33.05
2.71
Siderite
32.07
2.79
Opal-CT
21.94-21.67
4.05-4.10
Clinoptilolite
9.83
8.99