- 著者
-
宮久 三千年
石橋 澄
足立 富男
- 出版者
- 日本鉱物科学会
- 雑誌
- 岩石鉱物鉱床学会誌 (ISSN:00214825)
- 巻号頁・発行日
- vol.70, no.1, pp.25-29, 1975
- 被引用文献数
-
3
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 <i>α</i>=1.764, <i>β</i>=1.784-1.786, <i>γ</i>=1.801 and 2V (+) 84-86.<br> Chemical formula calculated from the analysis is:<br> Ca<sub>0.978</sub>Sn<sub>0.980</sub>Ti<sub>0.002</sub> Si<sub>1.002</sub>O<sub>5.000</sub><br>which is in good accord with Ca (Sn, Ti) SiO<sub>5.000</sub> of sphene-malayaite series.<br> Genetic considerations of ore-forming minerals, and problems of tin-mineral dressing are also discussed in this paper.