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Small (<0.5 mm), brownish-pink platy rosettes and yellow spherules, in cavities in nepheline syenite at the Diamond Jo quarry, Magnet Cove, have been identified as kassite, CaTi2O4(OH)2, a mineral previously known only from the Kola Peninsula, USSR. The X-ray powder and single-crystal data and density of the Magnet Cove kassite correspond with those reported by earlier workers for cafetite, (Ca,Mg)(Fe,Al)2Ti4O12.4H2O, from Kola, but the chemical and physical properties correspond with those given in their description of kassite.-J.A.Z.
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Kassite from the Diamond Jo quarry, Magnet Cove, Hot Spring County, Arkansas: the problem of cafetite and kassite.