Not all crystals are equally crystalline. There will often be impurities, as well as the ionic & covalent among molecules can produce vastly unique buildings outside of precisely the same materials. An awesome example of this are diamonds and graphene.
⒉棉、云雾或渣状包裹体、杂质在透明水晶内部有雾蒙蒙的现象或是感觉里面像有棉絮状、渣状物质一样的包裹体，这些包裹体的存在，影响水晶的整体美观。还有的水晶内局部含有黑斑或其他颜色的斑状物质，与水晶整体不协调，被视为水晶的杂质，有这种杂质的水晶是次品。
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。
Fig. 3: A library of lattice symmetries can be accessed by shifting the particle Main and DNA shell.
You'll find many alternative crystals determined by geometric structures, crystal progress, and materials. There could be preparations of hexagonal carbon atoms or amethyst that makes hexagonal pyramid buildings.
Clever Vocabulary: linked phrases and phrases Glass blower blowpipe bulletproof glass cut glass fibreglass frosted glassware glaze glazed glazier glazing prism prismatic punty Pyrex reglaze unglazed vitreous vitrification vitrify See additional benefits » You may as well come across connected words, phrases, and synonyms from the matters:
Include to phrase checklist Incorporate to term listing [ C/U ] clear rock that appears like ice, or possibly a bit of it
1A crystal chandelier lit the area.一盏水晶吊灯照亮了房间。《柯林斯英汉双解大词典》
Many crystals behave like butter in that they're tough at lower temperatures but gentle at better temperatures. They may be termed solids in any way temperatures beneath their melting place. A probable definition of the sound is really an object that retains its condition if remaining undisturbed. The pertinent issue is how much time the article retains its condition. A extremely viscous fluid retains its shape for an hour or so although not a yr. A good must hold its condition extended than that.
[ C/U ] transparent glass of top of the range, commonly with its area Lower into patterns that reflect mild
There are two these kinds of feasible periodic arrangements. In Every single, the first layer has the atoms packed into a aircraft-triangular lattice in which each and every atom has 6 speedy neighbours. Determine two exhibits this arrangement for the atoms labeled A
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 categorised on the whole categories, for example insulators, metals, semiconductors, and molecular solids. One crystal of the insulator is normally transparent and resembles a piece of glass. Metals are shiny unless they have rusted. Semiconductors are sometimes shiny and often clear but are hardly ever rusty. Several crystals might be categorized as just one type of sound, while others have intermediate behaviour. Cadmium sulfide (CdS) can be well prepared in pure sort and is a wonderful insulator; when impurities are extra to cadmium sulfide, it gets a fascinating semiconductor.
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