三色堇：从荒野精灵到花坛皇后的千年蜕变

在早春的花坛、窗台和公园里，一种花朵总是以其仿佛孩童涂鸦般生动有趣的面孔率先吸引人们的目光——它那三色交织的花瓣上，常常点缀着深色的斑块，酷似一张俏皮的“鬼脸”或“猫儿脸”，这就是三色堇。然而，这张看似天真烂漫的“面孔”背后，却隐藏着一部跨越数千年的 ...
Gemological Institute of America

Evidence of Rotation in Flame-Structure Pearls from Bivalves of the Tridacnidae Family

Even rarer in the literature are the flame-structure pearls from Cassis cornuta (Bari and Lam, 2009, pp. 73–75) and Pleuroploca gigantea (Koivula et al., 1994). The flame structure is encountered in ...