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A form of mica often found as micro-flakes in processed raw clays. It can often be found in the mineralogical analysis of materials.
| Materials | 3B Clay A fine-grained, tan burning, illitic stoneware with particulate and soluble salt impurities | 
| Materials | Mica | 
| URLs | http://mineral.galleries.com/minerals/silicate/micas.htm The Mica Group of Minerals | 
| URLs | http://en.wikipedia.org/wiki/Mica Mica at Wikipedia | 
| URLs | http://www.handbookofmineralogy.org/pdfs/Muscovite.pdf Muscovite mineralogy | 
| Minerals | Mica See Muscovite. | 
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