The Basic Principles Of Crystal
The Basic Principles Of Crystal
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27Local economists have seemed into their crystal balls and found some thing somewhat terrible.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》
按照透明度指标，水晶越透明，价格越高，好的透明的水晶加工出的成品晶莹剔透、光辉耀眼。透明度高的水晶能提升颜色的艳丽，否则显得呆板无灵性。光学水晶要求全透明、无双晶、无杂质。工艺水晶要求透明、少裂、少瑕疵。熔炼水晶要求透明，可有较多裂纹。三者价值依次降低，熔炼水晶只能作为熔炼水晶玻璃的原料。在工艺水晶中，晶体较大的，可用来做水晶眼镜和雕刻高档工艺品，因而价格较高。
结晶的形状非常细小，需要用显微镜才能看得清楚，外观上看起来是平滑、块状。常见最多的是各式玛瑙
Massive crystals of diamond are valuable gemstones. The crystal has other intriguing Attributes; it's got the highest audio velocity of any sound and is the greatest conductor of warmth. Other than diamond, another popular type of carbon is graphite, which is a layered product. Just about every carbon atom has a few coplanar in the vicinity of neighbours, forming an arrangement called the honeycomb lattice. Three-dimensional graphite crystals are obtained by stacking similar levels.
条痕颜色：无色。矿物粉末的颜色叫条痕。它可以消除假色，减弱他色，保留自色，是比矿物的颜色更为可靠的鉴定特征之一。
结晶�?When sea water is allowed to evaporate, salt crystals are deposited. 海水蒸发后，盐的结晶体就沉淀下来。
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。
There exists a similar directive about crystal glass which differentiates amongst full guide crystal, lead crystal and crystal.
One of the binary crystals, the best buildings to visualise are Those people with equivalent quantities of The 2 forms of atoms. The construction of sodium chloride is predicated on the cube. To construct the lattice, the click here sodium and chlorine atoms are placed on alternate corners of the cube, along with the construction is recurring (Figure 3B).
⑤化学稳定�?非常好，在常温下仅溶解于氢氟酸，不溶解于其它各类酸、碱。在高温高压条件下可溶解于碳酸钠溶液中。
say cheese a thing that somebody who is having a photograph of you informs you to mention so that the mouth can make The form of a smile
The sodium chloride crystal lattice is characterised because of the near packing of your constructive sodium ions and unfavorable chloride ions. Every single sodium ion is surrounded by six chloride ions, and every chloride ion is surrounded by six sodium ions, developing a remarkably steady and symmetrical composition.
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