A decorative bead in the shape of two truncated pyramids joined together. Its cross section is usually hexagonal, but it can also be square, heptagonal, or octagonal. It is most commonly made of quartz, but agate, glass, buried wood, and wax stone were also used. Most are 1-3 cm long with a bottom diameter of 1-1.5 cm, but there is also a large one measuring 6.2 cm long (excavated from the Koganezuka Tomb in Izumi, Osaka Prefecture). The holes are usually drilled from one side, but the larger ones are drilled from both sides. Cut glass beads were mainly used in the late Kofun period, but some can also be seen in the Nara period. A similar bead in the shape of two truncated cones is called an abacus bead because of its shape. [Mochizuki Mikio] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
截頭角錐(せっとうかくすい)を二つあわせた形の飾玉(かざりだま)。断面は六角形が普通だが、四角、七角、八角のものもある。材料は水晶がもっとも多く、めのう、ガラス、埋(うも)れ木、ろう石なども使われた。長さ1~3センチメートル、腹径1~1.5センチメートルのものが多いが、長さ6.2センチメートルという大形品(大阪府和泉(いずみ)黄金塚(こがねづか)古墳出土)もある。穿孔(せんこう)は片側からが普通だが、大きいものは両側から行っている。切子玉は主として古墳時代後期に使用されたが、奈良時代にもすこしみられる。似た玉で、截頭円錐を二つあわせた形の玉は、その形状から算盤玉(そろばんだま)とよばれている。 [望月幹夫] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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