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  Paragonite, also known as Natron-Glimmer, Paragonit or Paragonita, is a mineral, related to muscovite. Its empirical formula is NaAl2(Si3Al)O10(OH)2. A wide solvus separates muscovite from paragonite, such that there is little solid solution along the vector Na+K- and apparent micas of intermediate composition is most commonly a microscopic (or even sub-microscopic) intergroth of two distinct micas, one rich in K, and the other in Na. Paragonite is a common mineral in rocks metamorphosed under blueschist facies conditions along with other sodic minerals such as albite, jadeite and glaucophane.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Paragonite". A list of authors is available in Wikipedia.
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