epidote

{{Infobox mineral | name = Epidote | category = Sorosilicates | boxwidth = | boxbgcolor = #79941d | boxtextcolor = white | image = Эпидот(пушкинит).jpg | imagesize = 290px | caption = | formula = {Ca2}{Al2Fe3+}(SiO4)(Si2O7)O(OH) | IMAsymbol = Ep | molweight = | system = Monoclinic | class = Prismatic (2/m) (same H–M symbol) | symmetry = P21/m | color = Pistachio green, yellow-green, greenish black, brownish-green, green, black | habit = Prismatic with striations, fibrous, massive | twinning = On [100] | cleavage = {001} perfect and {100} imperfect | fracture = Flat regular to uneven | mohs = 6–7 | luster = Vitreous to resinous | refractive = nα = 1.715–1.751 nβ = 1.725–1.784 nγ = 1.734–1.797 | opticalprop = Biaxial (-) | birefringence = δ = 0.019–0.046 | pleochroism = Strong | streak = Greyish white | gravity = 3.38–3.49 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to nearly opaque | other = | references = }}

Epidote is a calcium aluminium iron sorosilicate mineral.