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Allanite-(La): Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Comments: A single prismatic allanite-(La) crystal with small, lustrous black magnetite crystals, all on a matrix of hedenbergite. Location: Mina Nueva Vizcaya, Sierra Gorda, Burguillos del Cerro, Badajoz, Spain. Scale: Crystal size 0.9 x 0.5 cm. © Fabre Minerals