"IGI Certified Natural Rare Epidote Certificate Number :700597249 Weight -4.56 Carat Color - Yellowish-Green Shape -Oval Cut - Brilliant/Step Dimensions - 13.07 x 11.42 x 4.48mm Transparency - Transparent Treatment -No Indications of heating " The Epidote group includes minerals like Epidote, Clinozoisite, Zoisite, and Piemontite, characterized by their complex silicate structure with calcium, aluminum, and other trivalent metals (Fe, Mn, V). Key members also feature rare-earth elements (Allanite) or substitutions like strontium and lead, forming solid-solution series (e.g., Epidote-(Sr), Hancockite, Mukhinite, Niigataite, Tweddillite) with specific chemical variations, all sharing similar crystal frameworks but differing in cation content, leading to distinct mineral names. Major Members Epidote: The namesake, rich in iron (Fe³⁺), giving it distinct green colors. Clinozoisite: The iron-free, aluminum-rich end-member, chemically similar to epidote but monoclinic. Zoisite: An orthorhombic dimorph of clinozoisite, forming a separate subgroup (e.g., Tanzanite, Thulite). Piemontite: Contains manganese (Mn³⁺), creating vibrant red to violet hues. Allanite: A complex member incorporating rare-earth elements (REEs) like Cerium (Ce). Other Notable Members & Substitutions Hancockite: A lead (Pb) bearing epidote. Mukhinite: Vanadium (V³⁺) rich. Niigataite: Strontium (Sr) rich. Epidote-(Sr): Contains strontium. Piemontite-(Pb/Sr): Lead or Strontium substitutions in piemontite. Key Characteristics Structure: Contain isolated [SiO₄] tetrahedra and [Si₂O₇] double tetrahedra with octahedral chains. Occurrence: Common in metamorphic rocks (low-grade metamorphism) and altered igneous rocks. Color: Varies from green (Epidote) to reddish (Piemontite) to colorless (Clinozoisite). Shipping 1-3 working days by FedEx