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Table 1 X-ray powder diffraction (XRPD) analysis showing quantitative bulk mineralogical composition for the six sandstones sampled from exploration well EPS-1 at the Soultz-sous-Forêts geothermal site (France).

From: The influence of hydrothermal brine on the short-term strength and elastic modulus of sandstones from exploration well EPS-1 at Soultz-sous-Forêts (France)

Box number Depth (m) Unit Quartz Orthoclase Microcline Muscovite illite–smectite Dolomite Siderite Hematite Kaolinite Chlorite
84 1008 Voltzia 74.5 ± 1.6 3.7 ± 1.9 9.3 ± 0.8 6.0 ± 2.9 4.7 ± 0.1 1.9 ± 0.2
100 1022 Intermédiaires 78.9 ± 1.7 5.6 ± 0.0 9.7 ± 0.5 5.0 ± 2.5 1.0 ± 0.3
157 1069 Karlstal 89.2 ± 0.4 4.6 ± 1.1 4.0 ± 1.7 2.0 ± 0.8 0.2 ± 0.1
198 1107 Karlstal 89.0 ± 1.1 3.2 ± 0.2 4.6 ± 0.0 3.2 ± 1.3
402 1290 Trifels 86.7 ± 1.6 3.0 ± 0.8 6.6 ± 0.3 3.5 ± 2.1 0.3 ± 0.0
540 1414 Anté-Annweiler 66.4 ± 4.0 4.4 ± 0.9 10.7 ± 0.7 13.1 ± 6.0 4.2 ± 0.5 1.4 ± 0.1
  1. Values in wt%