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。
A further enjoyable, and tasty, experiment will be to form huge crystals employing sugar. By heating sugar with drinking water and then permitting this Alternative evaporate on sticks, you are able to type rock sweet from sugar crystals!
晶及其石英岩类玉石是中低档宝玉石，虽比不上钻石、红蓝宝石的高贵，但在加工中如果构思巧妙而且加工精细，同样具有很高的价值。如中国传统的玛瑙“虾盘”、“龙盘”、“水漫金山�?水胆玛瑙摆件)都被誉为国家级宝玉石。
Tetragonal: These crystals variety prisms and double pyramids. The structure is like a cubic crystal, besides just one axis is lengthier than the opposite.
C2 [ U ] clear glass of really high-quality, ordinarily with its surface Lower into sensitive styles:
第二种是“半包裹体”，在水晶结晶以后，由于受到地球引力的影响而产生的裂隙，晶体外的一些物质通过水晶的裂隙渗透到水晶内部，一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹，常被称为“通道”，这种包裹体所形成的景象相对地较受自然环境和时间的影响，相应的价值也比较�?。
水晶原石观赏石，从字面意义理解：观赏水晶石的原貌，即经过抛光去皮后的包裹体水晶和原色水晶，不需雕刻不求象形就具有非常高的观赏价值和收藏价值。此类水晶观赏石对质地要求非常之高，水晶晶体通透干净，颜色艳丽，意境鲜明深刻的价值就高，它的价值特点就好比钻石，实实在在石头本身的价值。
市场上有很多人把熔炼水晶也叫做合成水晶，那是不准确的，一般都是以水晶废料为原料在高温高压下熔炼出来的，而不是结晶成的，不具备水晶的晶体特性，所以不能把熔炼水晶与合成水晶混为一谈；但是熔炼水晶耐高温，用优质二氧化硅熔炼成的熔炼水晶可以做成实用产品比如水晶杯、烤盘、茶具等，实际上一代伟人毛泽东主席的水晶棺就是选用东海优质水晶熔炼而成的。
Quite a few crystals behave like butter in that they're really hard at reduced temperatures but smooth at increased temperatures. These are identified as solids in any respect temperatures underneath their melting level. A probable definition of the solid is surely an item that retains its form if left undisturbed. The pertinent difficulty is how much time the thing retains its shape. A really viscous fluid retains its shape for an hour although not a yr. A solid should maintain its condition lengthier than that.
广义的包裹体是指宝石内部含有的与主晶宝石化学成分、物理性质等不同的物质。
天然性是水晶观赏石的基本特性。通常整体造型水晶矿物不饰雕琢就具备很高的观赏价值，但是包裹体水晶观赏石经常需要适当打磨抛光，这样更方便观赏水晶内部的包裹体。
You will find other minerals and molecules which will sort these crystal lattices. Snowflakes absolutely are a vintage illustration of a around symmetric and geometrically patterned construction from ice crystals, and gemstones of all versions are usually crystals.
14For case in point, We've got Quartz crystal clocks and watches precise to in 1 moment a calendar year.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。
crystal Alteration is variable: absent in several crystals, in Other people producing dense sericite aggregates which can click here exhibit some recrystallization outcomes to supply coarser-grained white mica. Through the Cambridge English Corpus The tridymite crystals are rectangular or wedge-shaped and are occasionally arranged in aggregates. From your Cambridge English Corpus On top of that, haloarchaeal cells were embedded within salt crystals beneath laboratory ailments and subsequently analysed by gentle microscopy. From your Cambridge English Corpus The white clouds (typically sparse) were being also commonly considered to be remaining made up of little crystals of drinking water ice, instead like cirrus within our atmosphere. With the Cambridge English Corpus These are found in evaporite salt lakes and can be trapped in salt crystals in the course of evaporation. Through the Cambridge English Corpus Hence, the cells (organelles and membranes) are destroyed mechanically by ice crystals, resulting in Loss of life through mobile lysis. With the Cambridge English Corpus The crystals had been Utilized in the main or second orders of reflection. From your Cambridge English Corpus In our 8xperiments, the crystals had been cubes using a foundation region of 8 e mm. In the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : influence of temperature and tension.