轴性、光性：一轴晶正光性。正交偏光下所看到的一轴晶干涉图是独特的，其黑十字臂未达中心，形成中空的图案，俗称牛眼干涉图。中心部分通常为淡绿色或淡粉色。
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。
4Without a crystal ball, It really is impossible to mention the place we are going to be subsequent 12 months.不用水晶球预卜未来，我们说不准明年处境如何呀。《牛津词典》
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。
Fig. four: Developing blocks with unique shapes and area chemistries immediate the formation of distinct crystal symmetries.
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�?。
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。
11I cautiously opened the package deal and located a crystal bell inside of.我小心地打开包裹，发现里面有一个水晶钟。
包裹体常见有固相、固液气三相组合、空洞以及双晶、色带等。水晶中典型的同生包裹体有自形的锐钛矿、气液两相包体等。
crystal The freshly crystallized quartz grains are characterized by elongate crystals oriented oblique on the shear band margins, defining a normal grain-shape foliation. 来自 Cambridge English Corpus We are saying the chain topology inside the high w region functions as the proverbial ' scratch-on-theglass ' desired in the organic and natural chemistry laboratory to generate crystals. 来自 Cambridge English Corpus The age scatter amongst the individual crystals may well reflect incorporation of xenocrysts from earlier magmatic pulses or protoliths. 来自 Cambridge English Corpus The clinopyroxene varieties neutral to pale brown, subhedral to anhedral crystals, at times containing inclusions of plagioclase microlaths and opaque phases.
用手去触摸水晶，天然水晶通常温度要比人造水晶的要凉的多；用眼观察，天然水晶通常有棉絮状的包裹体，这个是人造水晶所没有的。
Orthorhombic: They're rhombic prisms and dipyramids that resemble tetragons but without the need of square cross-sections.
The structure of the sodium atoms by itself, or perhaps the chlorine atoms on your own, is fcc and defines the unit mobile. The sodium chloride construction So is designed up of two interpenetrating fcc lattices. The cesium chloride lattice (Figure 3A) is predicated to the bcc composition; each other atom is cesium or chlorine. In this instance, the device cell is usually a dice. The third vital framework for AB
crystal Alteration is variable: absent in several crystals, in Other people making dense sericite aggregates which may show some recrystallization results to generate coarser-grained white mica. In the Cambridge English Corpus The read more tridymite crystals are rectangular or wedge-formed and are occasionally arranged in aggregates. From the Cambridge English Corpus In addition, haloarchaeal cells were embedded within salt crystals under laboratory circumstances and subsequently analysed by gentle microscopy. In the Cambridge English Corpus The white clouds (usually sparse) ended up also broadly considered becoming made up of little crystals of water ice, somewhat like cirrus in our environment. From the Cambridge English Corpus They are really present in evaporite salt lakes and will be trapped in salt crystals for the duration of evaporation. From your Cambridge English Corpus Thus, the cells (organelles and membranes) are destroyed mechanically by ice crystals, leading to death by mobile lysis. Within the Cambridge English Corpus The crystals had been used in the 1st or second orders of reflection. From your Cambridge English Corpus Within our 8xperiments, the crystals had been cubes using a foundation place of eight e mm. Through the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : influence of temperature and tension.