The organisms are essentially preserved as glass. You can see some of this amazing silicification type preservation in fossil from the Permian Reef Complex in the Guadalupe Mountains National Park, ...

This article was originally published with the title “Artificial Silicification of Limestones” in Scientific American Magazine Vol. 9 No. 22 (February 1854), p. 176 doi:10.1038 ...

The silicoflagellates are a class of enigmatic chrysophytes characterized by netlike skeletons composed of opaline silica. Other major groups of siliceous plankton—the diatoms and radiolarians—exhibit ...

The Ruby Hill epithermal gold-silver project covers a large area of argillic alteration and silicification hosted in rhyolite volcanics. Zones of silicification and clay alteration have been ...