Abstract
Malayaite is found in the contact skarn zone of Toroku mine, Miyazaki Prefecture. The crystals are commonly granular to massive shape, but sometime crystals show platy to wedgelike aspect, which reach to 3cm in length. Color is white to greenish gray. Luster is resinous. Fluoluminescence of greenish yellow color is observed, when on ultraviolet ray. The refractive indices are α=1.764, β=1.784-1.786, γ=1.801 and 2V (+) 84-86. Chemical formula calculated from the analysis is: Ca0.978Sn0.980Ti0.002 Si1.002O5.000which is in good accord with Ca (Sn, Ti) SiO5.000 of sphene-malayaite series. Genetic considerations of ore-forming minerals, and problems of tin-mineral dressing are also discussed in this paper.
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