sample of a magnesite rock on texture background. magnesite sedimentary rock sample. magnesite rock

semiprecious petrology pegmatite silicon dioxide matrix cupellation refractory gray gemmology gemology closeup decorative unprocessed isolated white mineralogy stone sample magnesium mineral specimen rock geology crystal object little background piece material pebble structure collection nature surface natural ore macro gemstone geological gem ornamental crystalline quartz magnesite sedimentary texture