New Step by Step Map For Crystal
New Step by Step Map For Crystal
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Not all crystals are equally crystalline. There are frequently impurities, along with the ionic & covalent amongst molecules can create vastly unique constructions from precisely the same substance. An incredible example of this are diamonds and graphene.
按照透明度指标，水晶越透明，价格越高，好的透明的水晶加工出的成品晶莹剔透、光辉耀眼。透明度高的水晶能提升颜色的艳丽，否则显得呆板无灵性。光学水晶要求全透明、无双晶、无杂质。工艺水晶要求透明、少裂、少瑕疵。熔炼水晶要求透明，可有较多裂纹。三者价值依次降低，熔炼水晶只能作为熔炼水晶玻璃的原料。在工艺水晶中，晶体较大的，可用来做水晶眼镜和雕刻高档工艺品，因而价格较高。
天然水晶是不可再生资源，随着开发的深入，天然水晶存量已越来越少，为了可持续发展，东海县政府早就制定了保护本地资源，鼓励开发海外水晶资源的政策，但是，海外资源也越来越少，很多国家都提高了开采和出口天然水晶的门槛，进入东海市场的外国水晶价格连年暴涨，其中观赏水晶比普通水晶涨价更快。
③次生包裹体：指主体水晶形成后，由于环境的变化使得主晶周围的一些物质沿裂隙进入到其内部而形成的包裹体。形成的原因有出熔作用、裂隙的结晶化、以及放射性元素破坏的作用等。水晶典型的次生包裹体有胶花水晶中的氧化铁充填物等。
2She was sporting a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
⑧、雕刻：立体感强，工艺高，做工精细，成本高。分手工雕刻图形、机器雕刻文字。
30Three days went past, and I had been shocked to check out it once again: all the openings were being sewed up by skinny and white thread plus they looked similar to the ice crystal on Wintertime's branches while in the north.
There's a equivalent directive about crystal glass which differentiates among comprehensive direct crystal, direct crystal and crystal.
Quite a few crystals behave like butter in that they are really hard at minimal temperatures but smooth at increased temperatures. They can be referred to as solids whatsoever temperatures beneath their melting point. A achievable definition of the good can be an object that retains its form if remaining undisturbed. The pertinent concern is how much time the article keeps its condition. A hugely viscous fluid retains its condition for an hour but not a yr. A sound ought to continue to keep its condition for a longer period than that.
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。
用手去触摸水晶，天然水晶通常温度要比人造水晶的要凉的多；用眼观察，天然水晶通常有棉絮状的包裹体，这个是人造水晶所没有的。
国家还并未给天然水晶提供一个等级划分的具体标准，水晶品种繁杂，每一品种都有他不同的评判标准。
14For case in point, We've got Quartz crystal clocks and watches exact to in just a single 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。
Yet click here another sort of crystalline carbon relies on the molecule with sixty carbon atoms identified as buckminsterfullerene (C60). The molecular condition is spherical. Every carbon is bonded to a few neighbours, as in graphite, and the spherical form is achieved by a mixture of twelve rings with five sides and 20 rings with six sides. Identical buildings ended up initially visualized with the American architect R. Buckminster Fuller for geodesic domes.