Crystals grow in caves, generally only one end is well developed, often in the form of hexagonal columns, hexagonal bipyramids or rhombohedrons, while the other end is not developed. Groups of crystals grown on the same substrate are called clusters and can be used as mineral crystal ornamental stones. The crystal cluster is a geometric polyhedron, with a variety of crystal growth forms, crystal clear, good crystal integrity, regular and peculiar shape, firm quality, stable physical and chemical properties
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