Geology and Minerals
The Hollybush Sandstone, locally referred to as the "Greensand" or "Greenstone", is a Cambrian aged geologic formation in the Malvern Hills of Worcestershire. It is primarily composed of sandstones, and contains a sparse record of shelly fossils.
Bisti/De-Na-Zin Wilderness.
Calcite.
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.