5 Easy Facts About Crystal Described
5 Easy Facts About Crystal Described
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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。
①压电效�?在机械力(压力或拉�?作用下，水晶单晶体的两端会产生电荷，其电量相等但符号相反。在工业上，无色、无缺陷、不具双晶的水晶常被用来作压电石英片。
A standard notion in crystal structures is the device cell. It's the smallest device of quantity that permits equivalent cells to become stacked alongside one another to fill all Room. By repeating the sample from the unit mobile time and again in all directions, the complete crystal lattice is often produced. A dice is The only illustration of a device cell. Two other illustrations are proven in Determine one. The main would be the unit mobile for the confront-centred cubic lattice, and the next is for your body-centred cubic lattice. These buildings are explained in the subsequent paragraphs.
Incorporate to word record Add to term checklist C2 [ U ] transparent glass of quite good quality, usually with its surface Slice into fragile styles
. These 4 buildings comprise most of the binary crystals with equal numbers of cations and anions.
无色水晶与无色长石因折射率和密度十分接近故较难区分。主要方法是放大检查。长石有两组极完全解理，显微镜下可见两组解理相交而成的“娱蛤状”包裹体或细直的纹理，而水晶则无解理发育，仅有时可见断续不规则的裂理。
30Three times went previous, and I had been amazed to find out it yet again: each of the openings ended up sewed up by skinny and white thread and so they appeared just like the ice crystal on winter's branches while in the north.
Ionic Crystals: Electrostatic forces type ionic bonds. A traditional get more info illustration can be a halite or salt crystal.
24I need to make my this means crystal obvious.我想把我的意思解释得清清楚楚。《牛津词典》
The definition of a strong seems noticeable; a reliable is generally considered becoming tough and agency. On inspection, nonetheless, the definition gets to be significantly less uncomplicated. A cube of butter, as an example, is difficult soon after currently being stored in the refrigerator and it is Obviously a strong. Right after remaining within the kitchen counter for per day, precisely the same cube becomes fairly smooth, and it's unclear When the butter need to however be considered a strong.
Solitary crystals of metals are comfortable and malleable, though polycrystalline metals are more durable and stronger and tend to be more valuable industrially. Most polycrystalline resources may be created into big one crystals right after prolonged warmth treatment method. Before blacksmiths would heat a bit of steel to make it malleable: heat can make several grains increase massive by incorporating more compact kinds. The smiths would bend the softened metal into condition after which you can pound it awhile; the pounding would help it become polycrystalline once again, increasing its power.
正常的水晶在生长时，多可以发现和柱形尖端棱线平行的生长纹（growth traces）。由于在地底、岩洞中的生长空间多狭窄，尤其在遇到地震时，或地壳变动时，甚至容易遭到其他矿石的挤压，常常会压迫产生不同的「晶面」。还有，当水晶还是在液态状的时候，常常也会包覆着其他的矿石、泥灰一起结晶成长，如金红石（稍后变成发晶）、火山泥灰（稍后变成幻影水晶）等等。所有的这些，都是「自然的一部分」，请不要视为「瑕疵」。
14For example, We've Quartz crystal clocks and watches exact to inside just one moment a yr.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。
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。