# Paragonite

#### Phyllosilicates,micas

Paragonite is a mineral. Its empirical formula 2[(OH separates muscovite from paragonite, such that there is little solid solution along the vector Na+K 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. During the transition from blueschist to greenschist facies , paragonite and glaucophane are transformed into chlorite Jadeite bearing pyroxene minerals have suggested Clinozoisite and paragonite are associated and derived from lawsonite and water via the following reaction:

4 CaAl 2 Si 2 O 8 ( H 2 O) 2 + NaAlSi 2 O 6 ↽ − − ⇀ 2 Ca 2 Al 3 Si 3 O 12 ( OH ) + NaAl 3 Si 3 O 10 ( OH) 2 + SiO 2 + 6 H 2 O {\displaystyle {\ce {4CaAl2Si2O8(H2O)2 + NaAlSi2O6 <=> 2Ca2Al3Si3O12(OH) + NaAl3Si3O10(OH)2 + SiO2 + 6H2O}}} {\displaystyle {\ce {4CaAl2Si2O8(H2O)2 + NaAlSi2O6 <=> 2Ca2Al3Si3O12(OH) + NaAl3Si3O10(OH)2 + SiO2 + 6H2O}}}

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