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Sunstones are feldspars, which are typically softer gemstones.  However, the sunstones coming from Oregon are harder at 7.2 on the Mohs Scale, which is as hard as an aquamarine.  Many of the sunstones are copper-bearing with schiller.  Schiller refers to platelet shaped pieces of copper naturally occurring in the gemstone.  Some of the sunstones are dichroic (containing two colors) and trichroic (containing three colors).