Gainesite, sodium zirconium, beryllophosphate; a new mineral and its crystal structure

Univ. Chicago, Dep. Geophys. Sci., Chicago, IL, United States

Gainesite, hypothetical end-member Na ₂ Zr ₂ [Be(PO ₄ ) ₄ ], a = 6.567(3), c = 17.119(5)angstrom, Z = 2, tetragonal, space group I4 ₁ /amd, is a new species from Newry, Oxford County, Maine. The color is delicate pale bluish lavender, hardness = 4 on Mohs' scale, luster vitreous, conchoidal fracture, specific gravity 2.94. The mineral occurs in small crevices in cleavelandite. R = 0.055 for 1072 independent reflections. Open framework structure.--Modified journal abstract.

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