Pyrometamorphism is a type of metamorphism in which rocks are rapidly changed by heat, eg. coming from a rapidly emplaced extrusive or intrusive igneous rock or from a fossil fuel fire. The rocks produced by pyrometamorphism include buchite, clinker and paralava, formed due to melting and/or recrystallisation of sedimentary rocks. Both natural and anthropogenic examples of sites with active pyrometamorphism are known. One well-known area of natural pyrometamorphic rocks is the Hatrurim Formation. Xenoliths of sedimentary rocks trapped in volcanic lava may undergo pyrometamorphic transformation, as can some contact wallrocks. Anthropogenic pyrometamorphic rocks are found in burning coal-mining dumps. A great number of minerals, sometimes very rare, are found within these rocks. Of the silic
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