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Title: Coral Fossil Replaced with Minerals
Caption: Cross-section of zaphrentid horn coral fossil replace with quartz and interior filled with blue fluorite. Reddish crystals are sphalerite. Mid to upper Mississippian Period. Annabel Lee Mine, Hardin County, Illinois, USA.
Credit: Album / Science Source / Mark A. Schneider
Image size: 5188 × 3436 px | 51.0 MB
Print size: 43.9 × 29.1 cm | 2042.5 × 1352.8 in (300 dpi)