🌳 Petrified Wood Agatized Egg with Quartz & Chalcedony Bands | Madagascar

This beautifully polished petrified wood agate egg reveals the natural artistry of fossilized wood preserved in quartz and chalcedony. Rich brown, tan, and reddish tones swirl through the surface, showing fine growth rings and cellular patterns from an ancient tree that lived millions of years ago. Over time, the organic wood material was replaced by silica-rich groundwater, transforming it into solid quartz while maintaining its intricate grain structure. The result is a breathtaking fusion of geology and ancient biology—a true piece of Earth’s prehistory turned to stone. ⸻ 🔬 Scientific Information • Mineral type: Agatized / silicified wood (fossilized wood replaced by SiO₂) • Composition: Quartz and chalcedony (SiO₂) • Formation: Silica percolation through buried wood, replacing cell walls molecule by molecule • Age: Often Jurassic to Triassic (~200 million years old) • Coloration agents: Iron oxides (red, brown), manganese (black), and carbon (gray) • Hardness: 6.5–7 on the Mohs scale • Luster: Vitreous to waxy when polished • Origin: Madagascar (noted for highly agatized fossil woods)