This skull is carved from banded agate, a variety of chalcedony known for its layered bands of color. The alternating light and dark layers form as silica is deposited in rhythmic patterns within cavities of volcanic rock, resulting in unique striping in every piece.

Why You’ll Love This

• Material: Banded agate (chalcedony, SiO₂)
• Size: Approximately 2 × 3 inches
• Appearance: Polished skull with parallel or curved bands in tones from white and gray to deep browns and blacks
• Formation: Develops as silica-rich fluids fill volcanic rock cavities, leaving layered deposits over time
• Physical Properties: Mohs hardness 6.5–7; vitreous luster; fine-grained microcrystalline quartz structure
• Educational Value: Demonstrates chalcedony formation, rhythmic mineral deposition, and the durability of quartz-based minerals

A striking combination of natural geology and craftsmanship, perfect as an educational specimen or decorative piece.