Everything about Crystal
Everything about Crystal
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看颜色：即使在同一种类的水晶中，它的不同部位的纹理、色泽也各式各有千秋。属于单色的，要色度均匀；在同一块水晶上有深浅的，则要求其色调纹路美观大方。
杂质、裂纹越少越好。质地好的水晶制品，应看不到星点状、云雾状和絮状分布的气液包裹体或组成玉石的颗粒。有裂纹、斑点，则属于次品。
Chemical Bonds The kinds of chemical bonds shaped in between atoms or groups of atoms in crystals rely upon their dimensions and electronegativity. You can find 4 categories of crystals as grouped by their bonding:
第一种是“全包裹体”，在水晶结晶的时候把这些物质包裹在晶体里面，这类包裹体所形成的各种景象，大多保持了水晶结晶时的原状，也就是说保存了几亿年的原状，极少受到自然环境的影响。
C2 [ U ] clear glass of incredibly good quality, commonly with its floor Lower into fragile styles:
These examples are from corpora and from resources on the web. Any thoughts within the illustrations usually do not signify the belief in the Cambridge Dictionary editors or of Cambridge University Push or its licensors.
时尚的收藏爱好者喜欢收藏天然水晶，却常常因为在市场上面对大量的合成水晶看走了眼。市面上的水晶：
发晶：无色、浅黄、浅褐等，可因含金红石常呈金黄、褐红等色，含电气石常呈灰黑色；含阳起石而呈灰绿色。
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A crystal program refers back to the classification of crystals depending on the geometric arrangement and symmetry in their lattice constructions. You'll find 7 main crystal units:
看孔眼：对于缀穿水晶制品（如项链、手链、佛珠），要看孔眼是否平直，孔的粗细是否均匀，有无细小裂纹。孔壁必须清澈透明，无“白痕”。
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。
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。
crystal Alteration is variable: absent in many crystals, in Other individuals generating dense sericite aggregates which may display some recrystallization consequences to create coarser-grained white mica. With the Cambridge English Corpus The tridymite crystals are rectangular or wedge-formed and are sometimes arranged in aggregates. With the Cambridge English Corpus In addition, haloarchaeal cells ended up embedded within just salt crystals underneath laboratory problems and subsequently analysed by light microscopy. From the Cambridge English Corpus The white clouds (ordinarily sparse) ended up also extensively considered to be remaining composed more info of very small crystals of drinking water ice, somewhat like cirrus within our ambiance. From your Cambridge English Corpus They are really present in evaporite salt lakes and might be trapped in salt crystals during evaporation. Through the Cambridge English Corpus Hence, the cells (organelles and membranes) are wrecked mechanically by ice crystals, resulting in Demise by way of mobile lysis. Through the Cambridge English Corpus The crystals were used in the primary or next orders of reflection. Within the Cambridge English Corpus Inside our 8xperiments, the crystals had been cubes by using a foundation region of 8 e mm. With the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : effect of temperature and strain.