
Ben S. answered 11/07/23
Knowledgeable Geology Tutor Committed to Helping Others Succeed
Double-terminated crystals are crystals with natural faces on both ends. They form in free-floating pockets of liquid that evaporate slowly, leaving perfectly formed crystals with two terminations. These crystals are usually found in sedimentary rock from subterranean marine deposits that were laid down through geologic history.