This page is currently not sponsored. Click here to sponsor this page.
Corundum Hill, Unionville, Newlin Township, Chester Co., Pennsylvania, USA
|Damourite, Gilbertite, Sericite|
A name sometimes used to refer to "altered" muscovite (e.g. with part of the interlayer potassium leached out), but the literature is full of inappropriately named examples. Hydromuscovite does not exactly equal "illite" and some hydromuscovites are mixed layer phyllosilicates.