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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.|