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Slate, marble, and granite were designated as the official state rocks of Vermont in 1991. Vermont has a complex geology with rich and diverse mineral resources. All three of the official state rocks were important to the minerals industry that began in Vermont over 200 years ago.
Slate, found in southwestern Vermont, is a metamorphic rock that splits into thin slabs. Slate is used for roofing shingles, sidewalks and floor tiles. Vermont slate comes in various colors - green, red, purple, and black.
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