Fascination About Crystal
Fascination About Crystal
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Not all crystals are equally crystalline. There are frequently impurities, and also the ionic & covalent among molecules can generate vastly unique structures out of exactly the same materials. A terrific example of this are diamonds and graphene.
⒉棉、云雾或渣状包裹体、杂质在透明水晶内部有雾蒙蒙的现象或是感觉里面像有棉絮状、渣状物质一样的包裹体，这些包裹体的存在，影响水晶的整体美观。还有的水晶内局部含有黑斑或其他颜色的斑状物质，与水晶整体不协调，被视为水晶的杂质，有这种杂质的水晶是次品。
对水晶进行评价主要依据其颜色、透明度、大小、净度、特殊图案及是否有光学效应等方面。以颜色纯正，浓度较高，内部无瑕为好。种类上紫晶最贵，其次为黄晶、烟晶、无色水晶和芙蓉石。有特殊光学效应的水晶的价格更高。
Fig. seven: A template-directed tactic can control The location of setting up blocks over a floor inside the development of complicated buildings.
25If you are a Billy Crystal supporter, you will like this movie.如果你是比利·克里斯特尔的影迷，你就会喜欢这部电影。《柯林斯英汉双解大词典》
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时尚的收藏爱好者喜欢收藏天然水晶，却常常因为在市场上面对大量的合成水晶看走了眼。市面上的水晶：
26Some of the finest drinking Eyeglasses are produced from lead crystal.一些最精致的酒杯是用铅晶质玻璃制成的。《柯林斯英汉双解大词典》
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。
say cheese something that someone who is having a photograph of you tells you to mention so that your mouth will make the shape of a smile
The essential units of solids are either atoms or atoms which have combined into molecules. The electrons of an atom shift in orbits that sort a shell structure round the nucleus. The shells are crammed in a systematic buy, with Each individual shell accommodating only a small amount of electrons. Different atoms Crystal have diverse figures of electrons, that happen to be dispersed in a very characteristic Digital construction of crammed and partly crammed shells.
The sodium chloride crystal lattice is characterized via the close packing on the good sodium ions and adverse chloride ions. Just about every sodium ion is surrounded by 6 chloride ions, and each chloride ion is surrounded by 6 sodium ions, creating a highly stable and symmetrical composition.
⑤、打孔：是在水晶成品未完成前，根据其所需打孔之尺寸及位置，以钻头加工，如制表件、笔筒、瓶孔等。
21You all know the way whenever you have a crystal prism and pass a beam of sunlight through it, you obtain a spectrum, which seems like a constant band of rainbow hues.