Calcite crystals will often be Utilized in optical devices, and even the graphite in pencil lead are sheets of crystals that fundamentally crack aside layer by layer to put in writing. Silica can variety silicate crystals which can be the basis for quartz, mica, olivine, and all kinds of other crystals and minerals.

无色水晶以晶莹美丽、洁净透明着称。衡量无色水晶主要看它的纯度，越纯、越透明越好。干净的、无瑕疵的、杂质少的价值就高。无色的水晶如果很脏，就没有利用价值。

A standard strategy in crystal buildings may be the device cell. It is the smallest unit of volume that permits similar cells being stacked together to fill all space. By repeating the pattern of your device cell time and again in all Instructions, the whole crystal lattice might be created. A cube is The only illustration of a device mobile. Two other examples are shown in Determine 1. The initial will be the device mobile to get a facial area-centred cubic lattice, and the 2nd is for a human body-centred cubic lattice. These buildings are stated in more info the following paragraphs.

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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 thoughts during the examples don't stand for the impression in 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。

如果水晶内部杂质中有传说中人物的造型，如佛、星座、生肖等价值可能要高于同等颜色和净度的水晶。

24I intend to make my this means crystal distinct.我想把我的意思解释得清清楚楚。《牛津词典》

[ C/U ] transparent glass of top of the range, normally with its surface area cut into designs that replicate light

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。

Crystallography is definitely the examine of crystals, and it specials with every thing from great geometric styles to seemingly random conglomerations of particles and minerals.

水玉：中国最古老的称法叫水玉，意谓似水之玉，又说是 �?千年之冰所�?�?。唐代诗人温庭筠《题李处士幽居》写道：�?水玉簪头白角巾，瑶琴寂历拂轻�?”。水玉一词最早频繁出于《山海经》：�?又东三百里，日堂庭之�?…�?多水�?”；�?丹山出焉，东南流注于洛水，其中多水玉 ”；�?逐水出焉，北流注于渭，其中多水玉 ”。司马相如《上林赋》曰�?�?水玉磊河 �?。水晶得名水玉，古人是看�?�?其莹如水，其坚如�?�?的质地。

Fig. five: The chance to realize described crystal habits is depending on the symmetry engineering technique.