8Where can we get this magic wand and crystal ball?我们到哪里获得这种魔棒和水晶玻璃球？

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。

Chemical Bonds The categories of chemical bonds fashioned among atoms or groups of atoms in crystals rely upon their size and electronegativity. There are four classes of crystals as grouped by their bonding:

诗中道出一段唐代由盛变衰的史实。玄宗末年，杨贵妃得宠，三姐妹并封为国夫人。他们养尊处优，奢华至极，仆人用水晶盘将珍馐佳肴端到宴席上，美人觉得没有口味，懒得动筷子。作为“诗圣”作为“史诗”，紫驼一段写饮食之精美，不空发议论，只尽情揭露事实，无一刺讥语，无一慨叹声，却使人于以外得之：此诗之善讽也。以史为鉴，这样的世道，这样的人物，国家不出“安史之乱”那样的大祸反倒不正常了。

Crystalline framework is characterised by a geometrical, repeating pattern of symmetric molecular framework. The arrangement of atoms sorts these requested, repeating styles.

你们都知道，拿起一个水晶棱镜，让一束阳光通过它，就会得到一个光谱，看起来就像一条连续的彩虹色带。

⑦、镀彩：运用类似电镀的手法在水晶表面以不同的色彩，层面较薄，经摩擦可划伤�?；出现划痕，由于镀彩经常位于底部，因此在镀彩底部经常采用其它对象附着，如生肖文镇。

To be a scorching Option cools or a saturated solution evaporates, particles draw close enough for chemical bonds to variety. Crystals could also form from deposition straight from the gas stage. Liquid crystals possess particles oriented within an organized manner, like reliable crystals, still will be able to move.

第三种是“皮景”，因某些其他的矿物与水晶体共生，或由于其他的物质侵蚀而依附于水晶表面，或者是水晶受自然环境的影响，在水晶表面出现蚀象，形成了一些景象或图案，这种景观存在于水晶表面。

多色�?无色水晶没有多色性。有色水晶有弱到强的多色�?表现为体色的不同深浅。

Solitary crystals of metals are comfortable and malleable, whilst polycrystalline metals are more durable and more powerful and are more beneficial industrially. Most polycrystalline components is usually built into substantial solitary crystals right after extended warmth treatment method. In past times blacksmiths would warmth a bit of metallic to really make it malleable: heat helps make several grains grow substantial by incorporating smaller sized kinds. The smiths would bend the softened steel into shape and after that pound it awhile; the pounding would allow it to be polycrystalline again, increasing its energy.

You will discover only some distinctive unit-mobile shapes, so numerous crystals share just one unit-mobile kind. A very important attribute of the unit cell is the volume of atoms it includes. The total amount of atoms in all the crystal could be the range in Every cell multiplied by the number here of device cells. Copper and aluminum (Al) Each and every have a single atom for every device mobile, though zinc (Zn) and sodium chloride have two. Most crystals have only a few atoms for every device cell, but there are many exceptions. Crystals of polymers, by way of example, have A huge number of atoms in each unit cell.

Crystals are categorized in general groups, including insulators, metals, semiconductors, and molecular solids. One crystal of the insulator is usually clear and resembles a bit of glass. Metals are shiny Except if they may have rusted. Semiconductors are sometimes shiny and from time to time transparent but are hardly ever rusty. Many crystals can be categorized as a single style of reliable, while some have intermediate behaviour. Cadmium sulfide (CdS) might be geared up in pure variety and is an excellent insulator; when impurities are added to cadmium sulfide, it gets a fascinating semiconductor.

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