Detailed Notes on Crystal

Detailed Notes on Crystal

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看颜色：即使在同一种类的水晶中，它的不同部位的纹理、色泽也各式各有千秋。属于单色的，要色度均匀；在同一块水晶上有深浅的，则要求其色调纹路美观大方。

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 kinds of chemical bonds shaped involving atoms or groups of atoms in crystals depend on their measurement and electronegativity. You will discover four categories of crystals as grouped by their bonding:

Fig. 3: A library of lattice symmetries might be accessed by transforming the particle core and DNA shell.

25If you are a Billy Crystal lover, you'll adore this movie.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：

Hexagonal �?Characterised by 4 axes, a few of that happen to be equivalent in duration and intersect at 120 degrees, that has a fourth axis perpendicular to the other a few.

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�?。

A crystal program refers to the classification of crystals based upon the geometric arrangement and symmetry in their lattice structures. You will find 7 main crystal units:

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。

Crystal Lattices You will discover 7 units of crystal structures, that happen to be also referred to as lattices or Place lattices:

压电性：水晶晶体受到压力时会产生电荷；反之，受到电压作用时，晶体会产生频率很高的振动。水晶具有可使压力与电荷相互转移的性能，称压电性。

This crystal composition is website chargeable for the special Bodily and chemical Houses of sodium chloride, which includes its significant melting level, electrical conductivity, and ability to kind ionic bonds conveniently.