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Tinto Hill is composed entirely of felsite, a fine grained but not glassy volcanic rock. It is high in silica or felsic, typically consisting of the minerals quartz, plagioclase feldspar and alkali feldspar. Felsite is usually called the extrusive equivalent of granite. It is very prone to frost shattering and felsite hills often produce active scree slopes.A maritime periglacial climate prevails in Scotland above about 600 metres resulting in sorted patterned ground on loose scree material.
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