5 Easy Facts About Crystal Described

5 Easy Facts About Crystal Described

Blog Article

27Local economists have seemed into their crystal balls and observed a thing rather nasty.当地的经济学者们已预测到将会出现棘手的问题。《柯林斯英汉双解大词典》

Bismuth (Bi) seems to become a metallic, but the amount of electrons readily available for electrical conduction is similar to that of semiconductors. In truth, bismuth known as a semimetal. Molecular solids are usually crystals formed from molecules or polymers. They can be insulating, semiconducting, or metallic, according to the sort of molecules during the crystal. New molecules are continuously staying synthesized, and a lot of are created into crystals. The amount of distinct crystals is big.

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。

看原料：选料精良的水晶制品，应看不到胶口及棉絮；质地纯净、光润、晶莹为好。

条痕颜色：无色。矿物粉末的颜色叫条痕。它可以消除假色，减弱他色，保留自色，是比矿物的颜色更为可靠的鉴定特征之一。

Sensible Vocabulary: associated terms and phrases Glass blower blowpipe bulletproof glass Minimize glass fibreglass frosted glassware glaze glazed glazier glazing prism prismatic punty Pyrex reglaze unglazed vitreous vitrification vitrify See far more success » You can even find related terms, phrases, and synonyms from the matters:

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：

There's a similar directive about crystal glass which differentiates between full guide crystal, direct crystal and crystal.

水晶是有成色等级之分，影响水晶价位的因素很多，不像钻石以4C就可以判定，所以大家要多听多看多比较才能真正辨别出来。一般的标准是水晶石越大越好，越透越好，颜色越娇嫩越好，形状越典型越好。不过最重要还是自己喜欢，而选购时辨识真伪的方法大致有下列几种：

A crystal program refers back to the classification of crystals depending on the geometric arrangement and symmetry in their lattice structures. There are 7 most important crystal devices:

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。

Crystals are categorized usually types, like insulators, metals, semiconductors, and molecular solids. An individual crystal of an insulator is usually clear and resembles a piece of glass. Metals are shiny unless they have rusted. Semiconductors are occasionally shiny and often clear but are hardly ever rusty. Several crystals could be categorized as just one form of stable, while others have intermediate conduct. Cadmium sulfide (CdS) may be organized in pure type and is a wonderful insulator; when impurities are added to cadmium sulfide, it gets an interesting semiconductor.

Another type of crystalline carbon relies on the molecule with 60 carbon atoms website referred to as buckminsterfullerene (C60). The molecular form is spherical. Every single carbon is bonded to three neighbours, as in graphite, plus the spherical condition is attained by a mix of 12 rings with five sides and twenty rings with six sides. Identical buildings ended up 1st visualized through the American architect R. Buckminster Fuller for geodesic domes.