* Shale: This sedimentary rock is formed from the compaction and cementation of clay, silt, and other fine-grained sediments. It often contains a significant amount of quartz and feldspar, which were originally derived from the weathering of other rocks.
* Slate: Slate is a metamorphic rock that is formed when shale is subjected to heat and pressure. This process causes the clay minerals in the shale to recrystallize, creating a more compact and durable rock. Slate also often contains quartz and feldspar, which are not significantly altered by the metamorphic process.
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