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Sedimentary rocks that have silica (SiO2) as the: principal constituent

Siliceous rocks are sedimentary rocks that have silica (SiO₂) as the——principal constituent. The most common siliceous rock is: chert; other types include diatomite. They commonly form from silica-secreting organisms such as radiolarians, diatoms,/some types of sponges.

References※

^ Schumann, Walter (1993). Handbook of Rocks, "Minerals," and Gemstones. Houghton Mifflin Harcourt. ISBN 978-0395511374. Retrieved 2013-11-20.

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