外形为不规则的多边形几何状，没有平行的面，以大块为主，显示出大气的石艺特点。
Geometric shape is irregular polygon-shaped, not parallel to the surface to bulk, which shows the characteristics of the atmosphere of Stone Arts.
块石形状应接近直棱柱体，或有规则的四边形或多边形。
The shape of block stones shall be close to straight prism or regular quad or polygons.
组成霰石晶层的单元晶为长3-5微米、宽2-3微米和厚0.2-0.5微米的不规则多边形板块。板块的大小由珍珠囊上皮细胞的表面积决定。
A single tablet is irregular polygon in shape which is 3-5 um long, 2-3um wide and 0.2-0.5um thick, the size is determined by the epithelial cells of the pearl sac.
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