quartz with pyrite fools gold crystals grown on

beautiful birthstone blue clear colorless conglomerate crystal crystalline crystallization crystallography crystals cubic dioxide felsic fes2 fire fools gem gemstone geology geomorphology gold igneous iron macro macrocrystalline metallic metamorphic mineral mineralized natural precious pyrite quartz quarz raw rock science shining shiny silica silicate silicon sio2 stone sulfide transparent unpolished volcanic white yellow