Not all crystals are equally crystalline. There are sometimes impurities, plus the ionic & covalent involving molecules can produce vastly unique buildings outside of precisely the same content. An incredible illustration of this are diamonds and graphene.
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发晶的价值取决于发的颜色、罕见性及大小，一般是发色鲜艳、块度大的价格高。水胆水晶的价值主要取决于水胆及晶体的大小、透明度的高低。如果水胆较大并有一定形态，便可加工成较为珍贵的工艺品。另外水胆中的水也有一定的科学研究价值，通过它们可了解几百万年前地球上水的成分及变化。
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Crystalline composition is characterised by a geometrical, repeating pattern of symmetric molecular composition. The arrangement of atoms varieties these requested, repeating styles.
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水晶与高档宝石的净度要求有很大不同。高档宝石稀少罕见，所以一般人们普遍对高档宝石的净度不会过于苛求。而水晶的产量着实大得惊人，所以通常人们会要求水晶净度越高越好，尽量避免有较明显的内含物的水晶。
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仿制钛晶树水晶：钛晶是水晶里价格最昂贵的，造假者当然也不会放过这么好的产品。天然的环境下，在水晶里能生长个像树一样的钛晶，完全是可能的，只是这样的货很少，那我们的造假专家是如何做的呢，白水晶底下打个洞，激光打点成板状的钛晶进去，就这样这块水晶的身价就能飙升几十倍。往往有的钛晶戒面，会采用将钛晶部位割成板状，与圆面的水晶粘合的方法来制作。
22Working from what The united states now understands about by itself, the bureau's authorities and also other demographers present an irresistible, if clouded, crystal ball amongst their visions.
There's two such achievable periodic arrangements. In Every, the initial layer has the atoms packed right into a airplane-triangular lattice in which each and every atom has six quick neighbours. Determine two displays this arrangement for the atoms labeled A
Molecular Crystals: Entire molecules are bonded to each other within an structured manner. A superb case in point is actually a sugar crystal, which has sucrose molecules.
14For illustration, Now we have Quartz crystal clocks and watches correct to inside of one moment a yr.例如，我们使用的每年误差不超过1分钟的石英水晶钟表和手表。
Binary crystals are found in quite a few structures. Some pairs of components kind multiple structure. At space temperature, cadmium sulfide may perhaps crystallize either during the zinc blende or wurtzite composition. Alumina also has two possible buildings at area temperature, α-alumina (corundum) and β-alumina. Other binary crystals exhibit distinct structures at unique temperatures. Among the many most advanced crystals are Individuals of silicon dioxide (SiO2), that has seven distinct buildings at numerous temperatures and pressures; the most typical of such buildings is quartz.