trimeriten./ˈtrɪməraɪt/Mineralogy a rare silicate of glucinum, manganese, and calcium, occurring in pinkish pseudo-hexagonal crystals, shown by their optical properties to be combinations of three triclinic individuals ( Cent. Dict. 1891).
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1896 A. H. ChesterDict. Names Minerals 274Trimerite, Silicate of glucinum, manganese, and calcium, found in brilliant pinkish crystals.