Definition: Kilbrickenite is a mineral with the chemical formula K2SiO4. It is a dark blue, silvery-white, or grayish-brown, crystalline rock that occurs in many parts of the world and is found primarily in the rocks of the Appalachian Mountains in the United States and Canada. Kilbrickenite is a type of calcite with a high degree of porosity, making it highly reactive and readily available as a source for minerals like quartz and feldspar
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