Epidote

Category: Sorosilicates

Chemical formula: {Ca2}{Al2Fe3+}[O|OH|SiO4|Si2O7]

Mohs scale hardness: 6-7

Refractive index: nα = 1.715 - 1.751 nβ = 1.725 - 1.784 nγ = 1.734 - 1.797

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