pargasite

{{Infobox mineral | name = Pargasite | category = Inosilicates | boxwidth = | boxbgcolor = #264d1c | boxtextcolor = #FFFFFF | image = Pargasite-ww49d.jpg | caption = Single crystal of pargasite, 1.5 cm long, on a matrix of white marble from Hunza Valley, Pakistan | formula = NaCa2(Mg4Al)(Si6Al2)O22(OH)2 | IMAsymbol = Prg | strunz = 9.DE.15 | dana = 66.1.3a.12 | molweight = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/m | color = Bluish green, grayish black, light brown | habit = Stout prismatic to tabular | 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 or pargasitic hornblende is a complex inosilicate mineral of the amphibole group with formula NaCa2(Mg4Al)(Si6Al2)O22(OH)2.