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: Trigonal Origin: Brazil Hardness: 7 on the Mohs scale; durable and easy to handle Treatment: None Dimensions: 5.8 × 5.7 × 9.1 cm Weight: 385 g Note: Acrylic stand included
