Everything about Crystal
Everything about Crystal
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27Local economists have looked into their crystal balls and observed anything relatively awful.当地的经济学者们已预测到将会出现棘手的问题。《柯林斯英汉双解大词典》
③、粗抛光：是将模具压出之毛胚，以金刚石盘直接磨出成品之刻线。④、细抛光：在粗抛光之后，以抛光粉来磨成品至晶莹剔透为止。
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。
水碧：《山海经》中，水晶又被称作水碧： �?又南三百里，日耿山，无草木，多水碧 �?，郭璞注�?�?亦水玉类 ”。这种称谓常被文人所引用，晋代郭景纯《璞江赋》道�?�?鬼，水碧�?�?。水晶又有人称它叫玉瑛。《符瑞图》载�?美石似玉，水精谓之玉瑛也�?”
25If you are a Billy Crystal admirer, you are going to 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》
第二种是“半包裹体”，在水晶结晶以后，由于受到地球引力的影响而产生的裂隙，晶体外的一些物质通过水晶的裂隙渗透到水晶内部，一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹，常被称为“通道”，这种包裹体所形成的景象相对地较受自然环境和时间的影响，相应的价值也比较�?。
根据包裹体和主晶宝石之间形成的先后关系可将水晶的包裹体划分以下三种类�?
Crystals are nothing more than an requested arrangement of molecules or atoms. Crystals can be found in numerous sizes and styles, and every one has distinct traits. The things they are created of establishes how it is going to type.
包裹体常见有固相、固液气三相组合、空洞以及双晶、色带等。水晶中典型的同生包裹体有自形的锐钛矿、气液两相包体等。
Solids that have limited-selection get but absence very long-assortment buy are termed amorphous. Nearly any substance might be manufactured amorphous by swift solidification within the soften (molten point out). This affliction is unstable, and the stable will crystallize in time. If your timescale for crystallization is several years, then the amorphous condition appears secure.
One crystals of more info metals are tender and malleable, though polycrystalline metals are harder and more robust and are more helpful industrially. Most polycrystalline components might be made into massive single crystals right after extended heat treatment. Up to now blacksmiths would heat a bit of metal to make it malleable: heat will make a handful of grains improve huge by incorporating lesser types. The smiths would bend the softened metal into form and after that pound it awhile; the pounding would enable it to be polycrystalline once again, escalating its strength.
Molecular Crystals: Full molecules are bonded to each other in an arranged fashion. A fantastic instance is really a sugar crystal, which includes sucrose molecules.
crystal, any stable product by which the ingredient atoms are arranged in a definite pattern and whose surface area regularity demonstrates its inside symmetry.
21You all know the way if you take a crystal prism and move a beam of sunlight through it, you will get a spectrum, which seems like a steady band of rainbow hues.