tumbled dark brown and shiny bronze bronzite stone polished crystal

ore semiprecious pyroxene cabochon crystalline semi precious stone variscite gold crystal gemstone gem shiny polished bronze shine tumble brown bronze stones almandine semigem hypersthene collection metallic isolated macro gemmology gemology texture enstatite geology geological semi-precious bronzite sample structure mineral jewelry natural piece rock specimen pebble background black closeup crop nature nutrition white