Igneous rock from a pegmatite. Large well developed apatite crystals with biotite, muscovite and quartz. Small amount of calcite precipitated on some surface areas at a later time.
Igneous rock from a pegmatite. Large well developed apatite crystals with biotite, muscovite and quartz. Small amount of calcite precipitated on some surface areas at a later time.
Igneous rock. Mineralized granite containing pyrite, sphalerite, bornite and galena. Oxidation of pyrite and sphalerite resulting in yellow and brown surface coating. Minerals are clearly visible only on uncoated surface.
Igneous rock. Mineralized granite containing pyrite, sphalerite, bornite and galena. Oxidation of pyrite and sphalerite resulting in yellow and brown surface coating. Minerals are clearly visible only on uncoated surface.