sample raw micaceous habit of biotite rock in the museum.

bedrock black boulder brown calcite carbon carbonate carving charcoal clay close-up coal divided economic feldspar formation fossil fuel geology granite gypsum hand hematite industrial isolated jewellery macro magnetite metal metallic microcline mineral museum natural nature object ore piece raw realgar rock rough sculpture specimen stone stonewall sulfate value sample hard oxides white blue hydrated potassium minerals crystal background glance spar micaceous habit