Slate is a low-grade metamorphic rock formed from mudstone (composed of muds, silts, and sands) through regional metamorphism during mountain-building events when tectonic plates collide; it forms at temperatures of approximately 300-400°C and pressures at depths of 5-15 km within the Earth's crust, where the alignment of flat mica and clay minerals creates cleavage that gives slate its characteristic platy, durable structure.
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Rock of the week - 4. Metamorphic rocks - Slate
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