Epidote
Epidote can be tea coloured to yellowish green, green and brown. It occurs in many forms, mostly in metamorphosed calcium rich rocks but also known in pegmatites.
Chemical Formular : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Refractive Index : 1.73 – 1.76
Hardness : 6-7 on the Mohs Scale
Crystal System : Monoclinic