Crystal Options
Crystal Options
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27Local economists have seemed into their crystal balls and seen some thing relatively 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》
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。
Chemical Bonds The categories of chemical bonds fashioned in between atoms or groups of atoms in crystals count on their dimensions and electronegativity. You can find four categories of crystals as grouped by their bonding:
If you want to see how crystals are fashioned, you may do some venture with your extremely possess kitchen area and find out the formation with the crystals take place with all your very own eyes . This may be completed by putting a small number of desk salt into some regular tap h2o, wait 24 hrs, and you may see pleasant cubed formations. This comes about as the h2o is evaporating, which triggers the atoms which make up the salt (the mineral) along with the water to return closer alongside one another.
看抛光：抛光的好坏直接影响到水晶制品的身价。抛光分为软抛光与硬抛光。
无色水晶与无色长石因折射率和密度十分接近故较难区分。主要方法是放大检查。长石有两组极完全解理，显微镜下可见两组解理相交而成的“娱蛤状”包裹体或细直的纹理，而水晶则无解理发育，仅有时可见断续不规则的裂理。
对任何宝石来说，颜色都是非常重要的，水晶也不例外。如果是水晶晶体是有颜色的，如粉水晶、黄水晶、紫水晶等，其颜色评价的最高标准则是明艳动人，不带有灰色、黑色、褐色等其他色调。如粉水晶，颜色以粉红为佳；紫水晶，要求颜色为鲜紫，纯净不发黑；黄水晶，要求颜色不含绿色、柠檬色调，以金橘色为佳。对于发晶来说，晶体的颜色也是很重要的。相同发丝的金发晶，晶体完全无色（白水晶）和晶体略偏茶色，肉眼的视觉观感也是有差别的，所以前者的价格会高于后者。
Crystals are nothing at all a lot more than an requested arrangement of molecules or atoms. Crystals can be found in many alternative sizes and shapes, and every one has distinct features. What they are created of establishes how it's going to sort.
Q.four. Exactly what is the distinction between atomic framework and crystal composition? Ans. The key difference between atomic construction and crystal composition lies within their definitions: atomic construction refers to how atoms are organized in a solitary molecule or perhaps a cluster of molecules, whereas crystal construction concerns the particular arrangement of atoms in a strong material.
颜色：无色，浅至深的紫色，浅黄、中至深黄色，浅至深褐、棕色，绿至黄绿色，浅至中粉红。
From the Cambridge English Corpus We are saying the chain topology from the large w area acts as the proverbial ' scratch-on-theglass ' needed from the organic chemistry laboratory to produce crystals. Within the Cambridge English Corpus Regular-pressure and temperature molecular-dynamics simulations of crystals on the lecithin fragments - glycerylphosphorylcholine and dilauroylglycerol. Through the Cambridge English Corpus Along with these, dust particles have already been observed in minimal-temperature plasmas, like Individuals Employed in plasma processing and plasma crystals. With the Cambridge English Corpus The ultimate Section of the reserve concentrates on peculiarities of strongly coupled dusty plasmas, such as the formation of dust crystals and related appealing forces. From the Cambridge English Corpus Entire characterization of damage threshold in titanium doped sapphire crystals with nanosecond, read more picosecond, and femtosecond laser pulses. From the Cambridge English Corpus Unbroken crystals are euhedral; rounded, or maybe more irregular, Principal morphologies were not noticed. Within the Cambridge English Corpus See all examples of crystal These illustrations are from corpora and from sources on the net. Any opinions during the illustrations never symbolize the viewpoint of your Cambridge Dictionary editors or of Cambridge University Push or its licensors.
正常的水晶在生长时，多可以发现和柱形尖端棱线平行的生长纹（expansion lines）。由于在地底、岩洞中的生长空间多狭窄，尤其在遇到地震时，或地壳变动时，甚至容易遭到其他矿石的挤压，常常会压迫产生不同的「晶面」。还有，当水晶还是在液态状的时候，常常也会包覆着其他的矿石、泥灰一起结晶成长，如金红石（稍后变成发晶）、火山泥灰（稍后变成幻影水晶）等等。所有的这些，都是「自然的一部分」，请不要视为「瑕疵」。
压电性：水晶晶体受到压力时会产生电荷；反之，受到电压作用时，晶体会产生频率很高的振动。水晶具有可使压力与电荷相互转移的性能，称压电性。
Binary crystals are located in numerous constructions. Some pairs of features kind more than one construction. At space temperature, cadmium sulfide might crystallize possibly during the zinc blende or wurtzite structure. Alumina also has two feasible constructions at area temperature, α-alumina (corundum) and β-alumina. Other binary crystals exhibit unique buildings at various temperatures. One of the most intricate crystals are Individuals of silicon dioxide (SiO2), which has seven diverse structures at numerous temperatures and pressures; the most common of these structures is quartz.