Paragonite n. : A kind of mica related to muscovite, but containing soda instead of potash. It is characteristic of the paragonite schist of the Alps.

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Taxonomy
Paragonite, free encyclopedia, minerals, micas, Phyllosilicate, search, Silicate mineral, AlSi3O10, pale yellow, apple-green, Space Group, Tenacity, Elastic, hardness, Optical properties, Biaxial, Ultraviolet fluorescence, Natron.

Defination from the web:
Paragonite, also known as Natron-Glimmer, is a mineral, related to muscovite. ... Paragonite is a common mineral in rocks metamorphosed under blueschist facies conditions along with other sodic minerals such as albite, jadeite and glaucophane. ...