The Basic Principles Of Crystal
The Basic Principles Of Crystal
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李商隐，杜牧，白居易，欧阳修，苏轼，呈大昌，辛弃疾，杨万里，吴文英，杨基，魏源等诗坛，词林大家都有歌吟水晶的佳篇传世。
杂质、裂纹越少越好。质地好的水晶制品，应看不到星点状、云雾状和絮状分布的气液包裹体或组成玉石的颗粒。有裂纹、斑点，则属于次品。
A standard notion in crystal buildings may be the unit mobile. It's the smallest device of quantity that permits similar cells to be stacked with each other to fill all Room. By repeating the pattern from the unit mobile repeatedly in all directions, your complete crystal lattice could be produced. A cube is The best example of a unit mobile. Two other examples are revealed in Determine 1. The primary is the unit mobile for the encounter-centred cubic lattice, and the second is to get a human body-centred cubic lattice. These constructions are discussed in the next paragraphs.
看原料：选料精良的水晶制品，应看不到胶口及棉絮；质地纯净、光润、晶莹为好。
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。
当二氧化硅结晶完美时就是水晶；结晶不完美的就是石英：二氧化硅胶化脱水后就是玛瑙；二氧化硅含水的胶体凝固后就成为蛋白石；二氧化硅晶粒小于几微米时，就组成玉髓、燧石、次生石英岩。
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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Metallic Crystals: Metals frequently type metallic crystals, the place a lot of the valence electrons are free of charge to move all Crystal through the lattice. Iron, for instance, can kind different metallic crystals.
[ C/U ] transparent glass of top quality, typically with its surface Minimize into patterns that reflect mild
地质学家目前为止对晶洞形成还没有广泛认同的理论，但相信晶洞可以在任何埋藏的空腔内形成。这些空腔可以是火成岩中的气泡、树根下的空穴，甚至动物挖的地洞。经过漫长时间，空腔的外壁变硬，溶解的矽酸盐或方解石沉积到内壁。再经过漫长的时间，缓慢渗入的矿物使得晶体在空腔内部结晶。
The sodium chloride crystal lattice is characterized through the close packing of your positive sodium ions and adverse chloride ions. Every sodium ion is surrounded by 6 chloride ions, and every chloride ion is surrounded by 6 sodium ions, developing a extremely stable and symmetrical structure.
14For instance, We've got Quartz crystal clocks and watches accurate to within 1 minute a 12 months.例如，我们使用的每年误差不超过one分钟的石英水晶钟表和手表。
21You all understand how whenever you take a crystal prism and move a beam of sunlight as a result of it, you will get a spectrum, which appears like a constant band of rainbow colours.