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Unnamed (Ga analogue of epidote)

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Formula:
CaCaAlAlGa(Si2O7)(SiO4)O(OH)
The gallium analogue of epidote. First Ga-dominant member of the supergroup.

Empirical formula (example): (Ca0.98Mn0.02)Σ1.00(Ca0.94Ce0.01Pr0.01)Σ0.96(Al0.89Fe0.11)Σ1.00Al1.00(Ga0.80Fe0.15Zn0.05Ti0.01Mg0.01)Σ1.02[Si3.01O11](OH,O)2.


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Varlamov, D.A., Yermolaeva, V.N., Chukanov, N.V., Jančev, S., Vigasina, M.F., Plechov, P.Yu. (2019): Novoe v mineralogii nadgruppy epidota: neobychnye himicheskie sostavy, tipohimizm, KR-spektroskopiya (New data on chemical composition and Raman spectra of epidote-supergroup minerals). Zapiski RMO: 1: 79-99; DOI: 10.30695/zrmo/2019.1481.07 (in Russian, with English abstract)

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