raw specimen of wolfram in quartz vein rock stone in the geology museum.

antimonite azurite background barite bedrock black blue boulder brass-yellow brown calcite carbon carbonate carving chalcopyrite charcoal clay close-up coal common copper divided economic feldspar formation fossil fuel geology granite gypsum hand hard hematite industrial iron jewellery lepidolite macro magnetite malachite manganese metal metallic mica microcline mineral minerals muscovite museum natural nature nonmetallic object opal ore oxides phyllosilicate piece psilomelane quartz raw realgar rock rough sample sculpture specimen stibnite stone stonewall sulfate sulfide talcum value vein white wolfram