Rumored Buzz on Crystal
Rumored Buzz on Crystal
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诗中“胜美玉”，“过冰清”，写出水晶的质地美，而“亦欲应时明”则描绘出水晶充满灵性的动态美，耐人寻味。罗维是有独特眼光，懂得水晶真谛，第一个称赞水晶超过美玉的伟大诗人。他的认识已被千年之后的科学理论所证实；以水晶为直接吟咏对象的诗篇还有：
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。
这种水晶观赏石特指水晶晶簇，它是众多单晶体集中生长在一起的晶体组合。晶簇以其晶莹剔透、独特造型而享誉水晶赏石界。
These illustrations are from corpora and from resources on the web. Any views inside the illustrations will not represent the view on the Cambridge Dictionary editors or of Cambridge University Push or its licensors.
水晶与高档宝石的净度要求有很大不同。高档宝石稀少罕见，所以一般人们普遍对高档宝石的净度不会过于苛求。而水晶的产量着实大得惊人，所以通常人们会要求水晶净度越高越好，尽量避免有较明显的内含物的水晶。
Like a scorching solution cools or a saturated Alternative evaporates, particles attract near ample for chemical bonds to kind. Crystals may variety from deposition straight from the gasoline phase. Liquid crystals have particles oriented within an structured method, like reliable crystals, yet will be able to circulation.
Crystals will often be considered as a thing of enormous natural beauty, and so they are commonly utilized with diamonds or other stones to create pieces of jewelry. The majority of crystals now are guy-manufactured in laboratories.
颜色：无色，浅至深的紫色，浅黄、中至深黄色，浅至深褐、棕色，绿至黄绿色，浅至中粉红。
15The trick to a great thermoelectric product is often a crystal structure during which electrons can stream freely.制造一种好的热电材料的关键是，需要一种电子可以自由流动的晶体结构。
You will find other minerals and molecules that could kind these crystal lattices. Snowflakes absolutely are a typical example of a roughly symmetric and geometrically patterned framework from ice crystals, and gemstones of all kinds are usually crystals.
Crystals are categorised normally types, for instance insulators, metals, semiconductors, and molecular solids. One crystal of an insulator is frequently clear and resembles a piece of glass. Metals are shiny Except they've rusted. Semiconductors are sometimes shiny and in some cases website transparent but are by no means rusty. A lot of crystals may be labeled as one style of solid, while others have intermediate conduct. Cadmium sulfide (CdS) is often ready in pure type and is an excellent insulator; when impurities are included to cadmium sulfide, it gets to be a fascinating semiconductor.
The C60 molecules, also called buckyballs, are rather sturdy and almost incompressible. Crystals are shaped this sort of which the balls are arranged in an fcc lattice by using a just one-nanometre spacing involving the centres of adjacent balls. The similar C70 molecule has the shape of a rugby ball; C70 molecules also kind an fcc crystal when stacked with each other. The stable fullerenes variety molecular crystals, with weak binding—supplied by van der Waals interactions—involving the molecules.