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{{Infobox mineral
name = Pargasite
category = Silicate mineral
boxwidth =
boxbgcolor =
image =
caption =
formula = NaCa2(Mg,Fe++)4Al(Si6Al2)O22(OH)2
molweight =
color = Bluish green, grayish black, light brown
habit = Stout prismatic to tabular
system = Monoclinic; 2/m
twinning = Simple and lamellar - common
cleavage = {110} perfect
fracture = Splintery
mohs = 5 - 6
luster = Vitreous
refractive = nα = 1.630 nβ = 1.640 nγ = 1.650
opticalprop = Biaxial (-)
birefringence = δ = 0.020 max.
pleochroism =
streak =
gravity = 3.04 - 3.17
density =
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Translucent, will transmit light on thin edges.
other =
references =}}

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

It was first described for an occurrence in Pargas, Finlandmarker in 1814 and named for the locality.

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.

References


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