Not known Factual Statements About Crystal
Not known Factual Statements About Crystal
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诗中“胜美玉”，“过冰清”，写出水晶的质地美，而“亦欲应时明”则描绘出水晶充满灵性的动态美，耐人寻味。罗维是有独特眼光，懂得水晶真谛，第一个称赞水晶超过美玉的伟大诗人。他的认识已被千年之后的科学理论所证实；以水晶为直接吟咏对象的诗篇还有：
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对水晶进行评价主要依据其颜色、透明度、大小、净度、特殊图案及是否有光学效应等方面。以颜色纯正，浓度较高，内部无瑕为好。种类上紫晶最贵，其次为黄晶、烟晶、无色水晶和芙蓉石。有特殊光学效应的水晶的价格更高。
Massive crystals of diamond are important gemstones. The crystal has other intriguing Attributes; it has the best sound velocity of any reliable and is the greatest conductor of warmth. Moreover diamond, one other typical sort of carbon is graphite, that is a layered material. Each and every carbon atom has 3 coplanar around neighbours, forming an arrangement known as the honeycomb lattice. 3-dimensional graphite crystals are received by stacking very similar levels.
Crystalline framework is characterized by a geometrical, repeating sample of symmetric molecular composition. The arrangement of atoms sorts these requested, repeating designs.
发晶，包括钛晶，铜顺发，绿发晶，黑发晶，银发晶，杂色发晶，其中钛晶最珍贵，少数钛晶价值可比钻石，红宝石和蓝宝石以及祖母绿。
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。
损伤是指水晶由于加工或不小心摔掉、碰撞等原因，人为造成的损坏。它可以是破口，也可以是凹坑等。
本词条由中国科学院大学地球与行星科学学院、中国科学院地质与地球物理研究所 参与编辑并审核，经科普中国·科学百科认�?。
The definition of the sound appears clear; a sound is mostly regarded as being difficult and organization. Upon inspection, on the other hand, the definition turns into less simple. A cube of butter, by way of example, is tough right after staying saved in a refrigerator and is particularly Evidently a reliable. Following remaining around the kitchen area counter for each day, a similar dice will become quite soft, and it is actually unclear When the butter must continue to be thought of a stable.
Solitary crystals of metals are tender and malleable, even though polycrystalline metals are more challenging and stronger and are more valuable industrially. Most polycrystalline materials could be created into big single crystals after extended warmth treatment. In the past blacksmiths would warmth a piece of metallic to make it malleable: heat makes a couple of grains expand big by incorporating smaller kinds. The smiths would bend the softened steel into shape and then pound it awhile; the pounding would enable it to be polycrystalline once again, increasing its energy.
The arrangement of the atom’s electrons establishes its chemical properties. The Attributes of solids are often predictable from your Houses of their constituent atoms and molecules, and the different shell constructions of atoms are hence to blame for the diversity of solids.
玉石纹理如果能形成美丽的花纹、图案，其价格就高，如玛瑙内红白相间的色带有规律地排列，形成缠丝玛瑙时，碧玉中的不均匀颜色形成一种风景图案时，材料的价值将提高。当水晶内包裹体形成美丽的图案时，如幽灵水晶、风景水晶，或者针状包裹体呈束状排列时，其价值都高于普通的水晶。图案越美观、越有意境越好。
crystal Alteration is variable: absent in lots of crystals, in Some others making dense sericite aggregates which can exhibit some recrystallization effects to create coarser-grained white mica. With the here Cambridge English Corpus The tridymite crystals are rectangular or wedge-formed and are sometimes organized in aggregates. From the Cambridge English Corpus Moreover, haloarchaeal cells have been embedded in just salt crystals underneath laboratory problems and subsequently analysed by mild microscopy. In the Cambridge English Corpus The white clouds (generally sparse) were also broadly regarded as staying composed of little crystals of water ice, alternatively like cirrus within our atmosphere. From the Cambridge English Corpus These are present in evaporite salt lakes and can be trapped in salt crystals during evaporation. Within the Cambridge English Corpus As a result, the cells (organelles and membranes) are destroyed mechanically by ice crystals, resulting in Demise as a result of mobile lysis. Within the Cambridge English Corpus The crystals have been Employed in the very first or 2nd orders of reflection. With the Cambridge English Corpus In our 8xperiments, the crystals were being cubes having a base location of 8 e mm. Through the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : result of temperature and tension.