Pargasite

Pargasite is a complex inosilicate mineral with formula NaCa₂(Mg,Fe²⁺)₄Al(Si₆Al₂)O₂₂(OH)₂.

It was first described for an occurrence in Pargas, Finland in 1814 and named for the locality.[3]

It occurs in high temperature regional metamorphic rocks and in the skarns within contact aureoles around igneous intrusions. It also occurs in andesite volcanic rocks and altered ultramafic rocks.[1]

References

1. ^ a b http://www.handbookofmineralogy.org/pdfs/pargasite.pdf Handbook of Mineralogy
2. ^ http://www.mindat.org/min-3119.html Mindat
3. ^ a b http://webmineral.com/data/Pargasite.shtml Webmineral

List of minerals