Agate egg (C) — Brazilian, with quartz geode

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A polished agate egg from Brazil, its glossy banded surface opening to a geode core of sparkling quartz in warm amber hues. Agate forms as silica-rich fluids fill volcanic cavities layer by layer; the quartz at the centre is the last stage of that slow growth. Mineral: Agate (chalcedony, a variety of quartz, SiO₂)Crystal system: TrigonalOrigin: BrazilHardness: 7 on the Mohs scale; durable and easy to handleTreatment: NoneDimensions: 5.8 × 5.7 × 9.1 cmWeight: 385 gNote: Acrylic stand included You'll receive the exact piece photographed. Show more