What is another word for argillite?
Pronunciation: [ˈɑːɡɪlˌa͡ɪt] (IPA) 
Argillite, also known as mudstone or shale, is a fine-grained sedimentary rock that is rich in clay minerals. Despite being commonly used to produce tools and weapons by indigenous peoples in North America, argillite is not a very well-known rock type. There are multiple synonyms for argillite, which can be helpful when describing this rock in various contexts. Some of the synonyms for argillite include claystone, mudrock, siltstone, and clay-rich rock. Other similar rocks that may be easily confused with argillite include slate, phyllite, and schist. Understanding the synonyms for argillite can provide geologists and other researchers with a better understanding of these rocks and their properties.
