8 Photos
Paragonite
Chemical Formula	NaAl2[(OH)2|AlSi3O10]
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	2.78
Color	Colorless, pale yellow, grayish, grayish white, greenish, light apple-green
Streak	White
Luster	Pearly
Refractive Index	n = 1.564 - 1.580 n = 1.594 - 1.609 n = 1.600 - 1.609
Diaphaneity	transparent to translucent
Cleavage	Perfect on the
Fracture	Micaeous
Crystal Habit：massive, fibrous or scaly

Paragonite, also known as Natron-Glimmer, is a mineral, related to muscovite. Its empirical formula is NaAl₂[(OH)₂|AlSi₃O₁₀]. 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) intergrowth 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. During the transition from blueschist to greenschist facies, paragonite and glaucophane are transformed into chlorite and albite.

It was first described in 1843 for an occurrence at Mt. Campione, Tessin, Switzerland. The name derives from the Greek, paragon, for misleading, due to its similar appearance to talc.