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- set of various gray unpolished rocks with names (antimonite, chromite, graphite, melilitolite, bornite, galenite, sphalerite, magnetite, hematite, cuprite, migmatite, argillite, etc) isolated on white Puzzle #354368342
set of various gray unpolished rocks with names (antimonite, chromite, graphite, melilitolite, bornite, galenite, sphalerite, magnetite, hematite, cuprite, migmatite, argillite, etc) isolated on white Puzzle #354368342