Not known Factual Statements About Crystal
Not known Factual Statements About Crystal
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A solid is crystalline if it's long-variety buy. After the positions of the atom and its neighbours are known at just one place, the put of each and every atom is thought exactly all over the crystal. Most liquids lack extended-vary buy, Despite the fact that numerous have brief-array buy. Short selection is outlined as the main- or 2nd-nearest neighbours of the atom. In several liquids the very first-neighbour atoms are arranged in a similar structure as during the corresponding reliable period.
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A primary notion in crystal structures would be the device cell. It's the smallest unit of volume that allows similar cells to get stacked jointly to fill all space. By repeating the sample on the device mobile time and again in all directions, your complete crystal lattice is usually created. A cube is The best example of a unit mobile. Two other illustrations are shown in Figure 1. The primary is the unit cell for your experience-centred cubic lattice, and the next is for the human body-centred cubic lattice. These buildings are explained in the subsequent paragraphs.
Most sound components found in nature exist in polycrystalline sort as opposed to as a single crystal. They are literally composed of millions of grains (tiny crystals) packed jointly to fill all space. Each individual grain has a different orientation than its neighbours. Despite the fact that very click here long-vary purchase exists within just one grain, at the boundary among grains, the buying improvements way. A normal piece of iron or copper (Cu) is polycrystalline.
2She was putting on a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
Lattices could have one lattice place per cell or more than one, yielding a complete of 14 Bravais crystal lattice styles. Bravais lattices, named for physicist and crystallographer Auguste Bravais, describe the 3-dimensional array created by a set of discrete details.
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。
如果水晶内部杂质中有传说中人物的造型，如佛、星座、生肖等价值可能要高于同等颜色和净度的水晶。
13Nearly all personal computers include a quartz-crystal clock to regulate their Procedure.几乎所有的计算机都有一个石英晶体时钟来调节它们的运行。
22Working from what America already knows about by itself, the bureau's professionals and other demographers give an irresistible, if clouded, crystal ball among their visions.
被主体水晶所捕获的包裹体。原生包裹体通常为固相，形态较规则。水晶中典型的原成包裹体有金红石、电气石、黄铁矿等，也会见到岩石碎屑或集合体。
Crystallography may be the research of crystals, and it discounts with every little thing from excellent geometric designs to seemingly random conglomerations of particles and minerals.
水精：水晶为何称为水精，《广雅》有巧解：�?水之精灵�?”；李时珍则说：�?莹洁晶光，如水之精英 ”。细加考究，此称还蕴含浓厚的宗教意味呢。水精一名，最初见于佛书，后汉支曜翻译的《具光明定意经》说：�?其所行道，色如水�?�?。
水晶的价值根据品质、块体的大小、美感和产量多少的不同相差较大。遇到好的天然水晶要敢于下手，但好的水晶一般大家都想得到，值与不值，就要看经验了。由于天然水晶的开采和制作原因，没有瑕疵的水晶很难得到，纯净的饰品要达到与合成水晶媲美的品质，实在是很难得。另外，由于水晶的特性，在佩戴过程中，也会改变其等级，比如因为某种原因，有可能会逐渐产生较大裂纹。