Table 1 Mineralogy of Opalinus Clay
Mineralogy | Shaly facies (wt%) | Sandy facies (wt%) | Carbonate-rich sandy facies (wt%) |
|---|---|---|---|
Clay minerals | |||
Illite, chlorite, kaolinite | 39–80 | 29–70 | 8–45 |
Illite/smectite mixed-layers | 5–20 | 5–15 | 3–8 |
Quartz | 10–27 | 22–44 | 22–36 |
Carbonates | |||
Calcite, dolomite, aragonite, ankerite, siderite | 4–35 | 11–25 | 34–57 |
Feldspars | |||
Albite, K-feldspar | 0.3–5 | 0.2–6 | 3–11 |
Pyrite | 0.9–1.4 | 1–1.2 | 0.2–0.5 |
Organic matter | 0.8–1.4 | – | – |
Accessory minerals | |||
Apatite, celestine, zircon, monazite | <0.1 | <0.1 | <0.1 |