chalcedony geode from brazil. natural mineral stone on a black background surrounded by moss. mineralogy, geology, magic

agate chalcedony geode crystal geology mineral stone abstract color natural adornment jewel semiprecious structure jewelry texture gem gemstone isolated material object transparent beauty bright jewellery nature shiny decoration ornament pattern semipellucid banded nice translucent glisten cleft fashion talisman textured luster round slice geological shape transparency light amber brown semigem