Hornstone


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hornstone

[′hȯrn‚stōn]
(petrology)

Hornstone

 

(hornstein), siliceous rocks (flints, jaspers, menilites) with admixtures of clay material and iron hydroxides; they form concretions and intercalations in carbonate and clay beds. Hornstones often contain carbonates and organic remnants, such as sponges and radiolarians.