The 5-Second Trick For Crystal
The 5-Second Trick For Crystal
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A sound is crystalline if it's got prolonged-array buy. Once the positions of the atom and its neighbours are known at 1 position, the location of each atom is understood precisely all through the crystal. Most liquids deficiency lengthy-array get, although many have brief-array purchase. Brief variety is defined as the initial- or second-closest neighbours of an atom. In several liquids the main-neighbour atoms are organized in a similar composition as from the corresponding stable period.
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。
一般而言，紫晶和黄晶是水晶中价值较高的品种。两者进一步的分级是据其颜色的深浅，颜色较深的为A级，稍浅的为B级。一般颜色较深的价格高，但要以不深暗为标准。颜色包括两种，一种是水晶本身的颜色，另一种是内部包裹体的颜色。水晶本身的颜色要艳丽、纯正，分布要均匀，不能太深或太浅，如澳州玉、蓝玉髓、紫晶、黄水晶，其价格就高。无色的水晶内含包裹体的颜色艳丽，其价格也高，如钛晶、绿幽灵、红兔毛。紫水晶一般以稍有云状物、颜色深紫、晶体通透的为上品。
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 construction is characterised by a geometric, repeating sample of symmetric molecular composition. The arrangement of atoms kinds these requested, repeating designs.
Monoclinic �?Characterized by a few unequal axes, two of which intersect at an oblique angle, whilst the 3rd is perpendicular into the aircraft of another two.
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②固体包裹体：指呈固态相存在包裹体，多因岩浆、热液、变质作用等形成的早期结晶物被水晶捕获而形成。
Crystals tend to be viewed as anything of huge natural beauty, plus they are generally employed with diamonds or other stones to produce items of jewelry. The majority of crystals now are gentleman-designed in laboratories.
Solids which have small-vary get but deficiency prolonged-range purchase are called amorphous. Practically any product is usually built amorphous by immediate solidification through the soften (molten condition). This affliction is unstable, and the reliable will website crystallize in time. Should the timescale for crystallization is decades, then the amorphous condition appears secure.
16I opened the box and noticed a piece of crystal snowflake as well as a greeting card with "Content Birthday" in the blank paper.我打开盒子并看见在白纸中有一片水晶雪花和一张写着“生日快乐”的贺卡。
隐晶类水晶外观是一块块的，不是成六角水晶簇状，但他们却也是属六方晶系的。但我们不能以肉眼观察到他们的六角形结晶，因为结晶的体积极为细小，需以显微镜协助下才能看到六角开结晶。而此类水晶非常平滑，因为结晶之间有“水化硅石”填补，玛瑙便属于此类。
crystal, any strong substance through which the element atoms are arranged in a very definite sample and whose floor regularity reflects its inside symmetry.
对于紫水晶黄水晶这样的单色水晶，通常要观察它的二色性，即使是最顶级的紫水晶黄水晶也是有色差的，通过这个方法可以鉴别是否加色。