Quartz crystals.
Hydrogenous mineral deposit.
Quartz crystal masses like this crystallize from silica-rich groundwater, filling in open fractures in bedrock. Quartz crystals occur in many places.This sample comes from a famous quartz crystal mining area in the Ouachita Mountains of Arkansas. In tha region, quartz crystal masses like this are associated with a broad belt of quartz veins in sedimenary rock formations of Paleozoic age. The crystals formed on open fractures that formed during the Ouachita Orogeny (a mountain-building period along the southern Arkansas and Oklahoma region late Pennsylvanian time).
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| https://gotbooks.miracosta.edu/rocks/sedimentary/42.html |
2/2/2021 |
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