Everything about Crystal
Everything about Crystal
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27Local economists have appeared into their crystal balls and noticed a little something alternatively 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》
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A basic notion in crystal constructions could be the unit cell. It's the smallest device of volume that permits identical cells to get stacked together to fill all Area. By repeating the sample of your device cell time and again in all directions, all the crystal lattice may be created. A cube is The only example of a device cell. Two other illustrations are demonstrated in Figure 1. The primary will be the device cell for your facial area-centred cubic lattice, and the next is to get a entire body-centred cubic lattice. These structures are explained in the subsequent 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。
这种水晶观赏石特指水晶晶簇，它是众多单晶体集中生长在一起的晶体组合。晶簇以其晶莹剔透、独特造型而享誉水晶赏石界。
⑧、雕刻：立体感强，工艺高，做工精细，成本高。分手工雕刻图形、机器雕刻文字。
解理：无解理。所谓解理是指矿物被打击时，沿一定方向有规则地裂开形成光滑平面的性质。根据解理的程度可以分为五类：极完全解理、完全解理、中等解理、不完全解理和无解理，水晶属于无解理。
The elements are identified in a variety of crystal packing arrangements. The most typical lattice structures for metals are Individuals attained by stacking the atomic spheres into one of the most compact arrangement.
本词条由中国科学院大学地球与行星科学学院、中国科学院地质与地球物理研究所 参与编辑并审核，经科普中国·科学百科认�?。
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。
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。
You'll find just a few distinct device-cell styles, so many alternative crystals share only one device-cell form. A vital attribute of a unit mobile is the volume of atoms it consists of. The full variety of atoms in the whole crystal is definitely the number in Every single mobile multiplied by the volume of device cells. Copper and aluminum (Al) Every single have just one atom for each device cell, while zinc (Zn) and sodium chloride have two. Most crystals have only a few atoms for each unit cell, but there are some exceptions. Crystals of polymers, one example is, have A huge number of atoms in each unit mobile.
Crystals are classified on the whole classes, like insulators, metals, semiconductors, and molecular solids. One crystal of an insulator will likely be transparent and resembles a piece of glass. Metals are shiny Except if they may have rusted. Semiconductors are occasionally shiny and often clear but are under no circumstances rusty. Quite a few crystals is often categorised as a single style of good, while others have intermediate behaviour. Cadmium sulfide (CdS) may be ready in pure kind and is a wonderful insulator; when impurities are added to cadmium sulfide, it turns into a fascinating semiconductor.
Good more info Vocabulary: connected terms and phrases Geology: mineralogy beneficiation crystalline deposit gemologist gemology gold dust graphite idiomorphic intercrystalline like gold dust idiom magnesium mineral nugget pyrite quasicrystal seam silicon unmined vermiculite vulcanicity See much more final results » It's also possible to discover associated words, phrases, and synonyms during the matters: