Geode quartz |
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Quartz Geode Quartz geodeHydrogenous sedimentary rock.A geode is a crystal filled cavity. They are typically round or oval in shape. This quartz geode came weathered out from a shale bed in the Mississippian age, Borden Formation, Lake Cumberland, Kentucky. The original cavity may have been a gas bubble, root trace, or hole from some other biological origin. |
| https://gotbooks.miracosta.edu/rocks/sedimentary/12.html | 2/2/2021 |