固态矿物按其质点(原子、离子、分子)有、无规则排列,可分为晶质矿物和非晶质矿物。造岩矿物绝大多数是晶质矿物。晶质矿物的内部质点作规则的排列,所以在适宜的生长条件下,这种有规律的排列使晶体具有一定的内部结构构造和几何外形。不同的晶质矿物,因内部结构不同,则晶体的几何形态也不相同,如方解石多为菱面体,云母则为片状,黄铁矿因生长条件不同 Solid minerals according to their particle (atoms, ions, molecules) have, irregular arrangement, can be divided into crystalline minerals and amorphous minerals. The vast majority of rock-forming minerals are crystalline minerals. The regular arrangement of the internal particles of the crystalline minerals, so under the appropriate growth conditions, this regular arrangement of the crystal has a certain internal structure and geometry. Different crystalline minerals, because of the different internal structure, the crystal geometry is not the same, such as calcite rhombohedral, mica is flaky, pyrite due to different growth conditions