Chert (Wikipedia)

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Chert (/ˈtʃɜːrt/) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood.

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This building is the dominant feature of the capitol grounds, with its dome 287 feet (87 m) high, making it the tallest self-supporting masonry dome in the United States, and fifth tallest in the world, surpassed only by St. Peter’s Basilica in Rome, St. Paul’s Cathedral in London, Global Vipassana Pagoda in Mumbai, and Santa Maria Del Fiore in Florence.

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2023-11-15

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Jasper is a variety of chert formed as primary deposits, found in or in connection with magmatic formations which owes its red color to hematite inclusions.

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https://en.wikipedia.org/wiki/Chert

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