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Cumberlandite sterling silver ring with hammered silver band.  Size 8.  Cumberlandite is found in the U.S. only in Rhode Island, and is the RI state rock.  This beautiful rock, sometimes mistaken for a meteorite when polished, contains 21 materials including titanium.  The attached photo of the cumberlandite slab (not for sale) displays green olivine crystals in some cumberlandite.