フラックス法によるエメラルド単結晶の成長過程での結晶面の消長
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概要
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Both spherical seeds of 5 and 10mm in diameters and cubic seeds of 5 and 10mm in length, cut parallel to crystallographic and noncrystallographic orientations were prepared from natural beryl crystals. Their surfaces were polished and made smooth. These were used as seeds in growth of emerald from V_2O_5 flux. so as to investigate appearance and disappearance of crystal faces during growth. All experiments were carried under the condition of 1050℃ for growth temperature and 10℃ for Δt. When a spherical seed of 10mm was used, m(101^^-0) and c (OOO1) appear at the earliest stage (before 5hrs), followed by the appearance of a (112^^-0), p (101^^-1), o (112^^-2), s (112^^-1), u (202^^-1), v(213^^-1) and n (314^^-1) after 8hrs. After 10hrs, u-, v- and n-faces disappeared. A small prism face (314^^-0) was observed between m-and a-faces, and soon disappeared as growth proceeded. o-, s- and p-faces disappeared after 200, 250 and 275hrs, respectively .The final morphology after 275hrs was hexagonal prism consisting of only c(0001) and m(101^^-0). In the case of cubic seed of 10mm cut parallel to noncrystallographic orientation, c(0001), m(101^^-0) and a (112^^-0) faces appeared at first (after 5hrs), followed by the appearance of p-, s- and o-faces after 24hrs. The latter two faces disappeared after 165 hrs and the former face after 270hrs. The final form was again hexagonal prism consisting of c (0001) and m (1010^^-) only. In the case of cubic seed of the same size cut parallel to crystallographic orientations, the faces parallel to the cut plane appeared and developed well at first, but u-, v- and n- faces, which all inclined at higher angle to the c-face, disappeared after 100hrs. o- and s-faces remained after 300hrs and p-face after 500hrs. In any case, the final forms were similarly hexagonal prismatic form consisting of c (0001) and m (1010^^-) faces.
- 宝石学会(日本)の論文
- 1977-06-15