大家都知道,許多礦物——石英、長石、岩鹽、寶石在自然界中是以天然的多面體——結晶體的形態出現的。同樣地許多人都知道,某些化學産品——明礬、硫酸鹽、硫酸銅和糖可以在溶液中以發育成良好的結晶體形態分離出來,但是人們並不是全知道所有我們周圍的固體物質都是結晶體所組成的(玻璃、松香、塑膠以及其類似的材料是例外),花崗岩、大理石、幾乎所有的岩石,所有金屬、磚塊、已硬結了的水泥,所有的建築石材——天然的和人工的,以及冰雪等等 We all know that many minerals - quartz, feldspar, rock salt, gem in nature is a natural polyhedron - the appearance of crystals. It is also common knowledge to many that certain chemicals - alum, sulphate, cupric sulphate and sugar, can separate in solution to develop good crystalline forms, but not all are aware that all the solid matter around us is Crystals are the exception (glass, rosin, plastic and similar materials are exceptions), granite, marble, almost all rock, all metals, bricks, hardened cement, all building stones - natural and artificial And snow and so on