Slate roofs get their colors from mineral impurities within the rock. The chemical composition of slate includes clay minerals such as illite and kaolinite, as well as other minerals like quartz, mica, and calcite. The color of slate varies depending on the type and amount of mineral impurities present, with iron oxide causing red, brown, or green hues, copper producing blue or green, manganese causing purple or pink, and carbon creating black. The mineral impurities are usually distributed unevenly, creating interesting patterns on slate roofs. The appearance of slate roofs can also be affected by exposure to the elements and weathering over time. for more - https://www.slateassocia...
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