Oyelite was found from serpentinite body in Suisho-dani, Ise City, Mie Prefecture, Japan. Oyelite, which occurs as white massive aggregates in rodingitic rock derived from gabbroic pegmatite, is accompanied with hydrogrossular, 11Å-tobermorite, bultfonteinite, ettringite group mineral, apophyllite and calcite.
The cell dimensions are a=11.23(1)Å, b=7.24(1)Å, c=20.42(1)Å, and V=1, 660(2)Å
3. The empirical formula (based on O=29) by wet chemical analysis is Ca
10.01, B
1.74 Alp
0.19 Sie
8.05 O
29 12.25 H
2O, corresponding to the ideal formula Ca
10 B
2 Si
5 O
29 12 H
2O. The endothermic peak in DTA appears at 200°C, and the exothermic peak appers at 8011°C. The major weight loss by TG is observed in the regions at about 200°C. Oyelite, which heated at 300°C and 1, 0001°C for 1 hr, changes into 9.3Å-tobermorite and wollastonite in the X-ray diffraction patterns. The infrared absorption spectrum at 25°C gives strong peaks at 3, 500-3, 000, 1, 440, 965, 857, and 463cm
-1, and after heating at 300°C, the I. R. spectrum indicates absorption peaks at 3, 600-3, 400, 1, 390, 970, and 475cm
-1.
Oyelite was produced from a hydrothermal solution with BF
3, in the later stage of the rodingitization (calcium metasomatism).
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