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Acasta Gneiss, Minnesota
This is a great specimen of Morton Gneiss. One face is polished!
Morton Gneiss is among some of the oldest rocks on Earth. In fact, it is the oldest rock unit in the United States. Composed of Archean-age migmatitic gneiss, it has been dated to 3.6 billion years old.
Size: 35mm L X 35mm W X 30mm D, Weight: 81 grams
This is the exact specimen for sale.
Ships with information, tag and COA. Guaranteed Authentic.