Definition: Acridite, also known as lime-blasted clay, is a type of sedimentary rock that forms from the reaction of lime or other acids with calcium carbonate in a volcanic eruption or after metamorphism. Acridite rocks can range from fine-grained to extremely massive and contain a variety of mineral content including quartz, feldspar, micas, and various iron oxides. They are usually dark brown or yellowish-brown in color due to the presence of magnesium oxide (MgO). The term "acaractite" is also used for similar rocks but with different mineral composition.
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