Agate egg (D) — Brazilian, with quartz geode

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A polished agate egg from Brazil with intricate natural banding and an open geode centre of sparkling quartz crystals. Agate forms layer by layer as silica-rich fluids fill cavitie s in volcanic rock, the crystal pocket at its core marking the final stage of growth. Mineral: Agate (chalcedony, a variety of quartz, SiO₂)Crystal system: TrigonalOrigin: BrazilHardness: 7 on the Mohs scale; durable and easy to handleTreatment: NoneDimensions: 5.5 × 5.5 × 8 cmWeight: 310 gNote: Acrylic stand included You'll receive the exact piece photographed. Show more