Crystal Fundamentals Explained
Crystal Fundamentals Explained
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对这类水晶晶簇观赏石的欣赏与评价，主要是强调晶体的完整、品种的名贵（如紫水晶、烟晶、发晶等）、造型奇特、含有名贵晶体（如辰砂、辉锑矿等）伴生等。晶簇产于矿床晶洞中，长相完美的并不多见，要完整无损地采集下来，又比较困难，故而采集起来代价较大，精品晶簇价值也就昂贵了。
无色水晶以晶莹美丽、洁净透明着称。衡量无色水晶主要看它的纯度，越纯、越透明越好。干净的、无瑕疵的、杂质少的价值就高。无色的水晶如果很脏，就没有利用价值。
景观水晶，就是包裹体组成各种造型特异的水晶，有的似山水，有的似人物，有些像文字，有些像动物，植物，器物等等。
Most good products located in mother nature exist in polycrystalline form as an alternative to as only one crystal. They are literally composed of countless grains (tiny crystals) packed together to fill all Place. Every single person grain has a unique orientation than its neighbours. Though extensive-assortment purchase exists inside of one grain, on the boundary in between grains, the ordering improvements way. An average bit of iron or copper (Cu) is polycrystalline.
25If you are a Billy Crystal fan, you can love this film.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》
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。
水晶的评价标准和高端宝石有所不同。多数高端宝石把颜色放在评价的第一位，而对水晶来说，颜色和净度（水晶行业称作晶体）是近乎同等重要的因素：
26Some of the finest ingesting Eyeglasses are constructed from guide 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》
Q.4. Exactly what is the distinction between atomic composition and crystal structure? Ans. The key distinction between atomic framework and crystal construction lies inside their definitions: atomic construction refers to how atoms are organized inside of a single molecule or simply a cluster of molecules, While crystal construction fears the specific arrangement of atoms inside a stable material.
Solids that have shorter-assortment get but deficiency very long-vary order are referred to as amorphous. Just about any materials is usually manufactured amorphous by fast solidification through the soften (molten state). This ailment is unstable, as well as the strong will crystallize in time. If your timescale for crystallization is decades, then the amorphous point out appears secure.
There are 2 these feasible periodic preparations. In Each individual, the initial layer has the atoms packed right into a airplane-triangular lattice in which each and every atom has six rapid neighbours. Determine 2 exhibits this arrangement for your atoms labeled A
You can find only a few unique unit-mobile styles, so many various crystals share just one unit-cell variety. An important characteristic of a device mobile is the number of atoms it includes. The overall amount of atoms in your complete crystal would be the range in Each individual cell multiplied by the amount of unit cells. Copper and aluminum (Al) each have 1 atom for each unit cell, although zinc (Zn) and sodium chloride have two. Most crystals have only a few atoms for each unit cell, but there are many exceptions. Crystals of polymers, website such as, have A huge number of atoms in Each and every device cell.
The framework on the sodium atoms by itself, or the chlorine atoms by itself, is fcc and defines the unit mobile. The sodium chloride construction So is made up of two interpenetrating fcc lattices. The cesium chloride lattice (Determine 3A) relies within the bcc framework; every other atom is cesium or chlorine. In this instance, the device mobile is often a cube. The 3rd essential framework for AB
Fig. five: The chance to recognize described crystal behaviors is depending on the symmetry engineering technique.