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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.