Allanite

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A monoclinic mineral, 2[(Ca,Y,Ce)2 (Fe,Al)3 O(OH)(Si2 O7 )(SiO4 )] ; epidote group; massive, pitchy, slightly radioactive, and metamict; a minor accessory in felsic igneous rocks and pegmatites. Formerly called orthite; cerine; bucklandite; treanorite. Syn: yttro-orthite
Source: Dictionary of Mining, Mineral, and Related Terms


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