Deformed quartz veins in slate, close-up. These bands of quartz (speckled white, black and blue) are surrounded by slate. Quartz is a mineral formed from silica, while slate is a fine-grained metamorphic rock, transformed under heat or pressure from sedimentary rock (clay or volcanic ash). Quartz bands, or veins, are formed as water seeps through the slate, which results in crystal growth on the walls of the planar fractures.
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