Large Petrified Wood with Quartz Druzy, Rare Fossil Wood Germany, Collector Specimen (#35) Tanzanite Necklace Both carnelian and sard are Both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide This Fluorite specimen fluoresces under UV lighting resulting in pieces that display both natural wood textures and crystalline formations—making each specimen a distinctive example of geological transformation display quality specimen Rare locality (now closed site) Strong visual contrast between fossil wood and crystal This is from one of the best batches we have secured