Epidote

Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Colour: Yellowish-green, green, brownish-green, black

Lustre: Vitreous

Hardness: 6

Specific Gravity: 3.38 – 3.49

Crystal System: Monoclinic

Member of: Epidote Group > Epidote Supergroup>Clinozoisite Group. The Al2Fe3+ analogue of Clinozoisite

Name: Named in 1801 by Rene Just Haüy from the Greek επιδοσιζ (“epidosis”), meaning “increase”, in allusion to the crystal characteristic of one longer side at the base of the prism.

Type Locality: Le Bourg-d’Oisans, Grenoble, Isère, Auvergne-Rhône-Alpes – France