Agate Bookends, Brazil

Name: Houston Museum of Natural Science Agate Bookends, Brazil - Agate Bookends, Brazil
Brand: Houston Museum of Natural Science
SKU: 46357909405916
Price: 50.0 USD
Availability: InStock

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Color

Black

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Description

Agate forms in the nodule cavities of volcanic rock when silica-rich fluids seep through the volcanic material. Similar to geodes, layers of chalcedony and quartz are built up within the cavity over time, different minerals and concentrations determining the color of each layer. Crystals can form within the agate, reaching inwards to the ...