我们三个是地质上通常所说的“老三石”。因为我们三个好像在血缘上有所联系,即我们所组成的化学成分都是A1[A1SiO_5],而且都是以“Si”和“O”构成了四面体结构,因此,就把我们称之为“老三石”。尽管我们的成分相同,但生长的样子却不相同,所以,地质把我们又叫做“同质异像”了。由于我们的身形(晶体)和颜色又各有特征,所以,给我们又分别起了不同的名称。即蓝晶石、红柱石、硅线石(矽线石)。①我叫蓝晶石的原因,是因为 The three of us are usually referred to geologically as the “Third Stone.” Because the three of us seem to be related to blood, that is, the chemical composition we make is A1 [A1SiO_5], and both of them form a tetrahedron structure with “Si ” and “O ” Call us “old three stone”. Although our composition is the same, but the appearance of growth is not the same, so the geology called us “homogeneous”. Because of our own physique (crystal) and color have their own characteristics, so, gave us a different name respectively. Namely kyanite, andalusite, sillimanite (sillimanite). ① My name is kyanite, because