|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Brazil > Quartz var. Polyhedral Agate Geode
|Quartz var. Polyhedral Agate Geode
|Rio Grande do Sul, Brazil
|Rectilinear banded quartz geode with hollow center. The polyhedral shape is due to the quartz geode forming in a cavity confined by flat outer crystals, possibly calcite, that eventually dissolved away. Some zones fluoresce green under UV illumination. Ex. Robert C. Lambert (1919-2008)
|For reference only
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