The Definitive Guide to Crystal
The Definitive Guide to Crystal
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对这类水晶晶簇观赏石的欣赏与评价，主要是强调晶体的完整、品种的名贵（如紫水晶、烟晶、发晶等）、造型奇特、含有名贵晶体（如辰砂、辉锑矿等）伴生等。晶簇产于矿床晶洞中，长相完美的并不多见，要完整无损地采集下来，又比较困难，故而采集起来代价较大，精品晶簇价值也就昂贵了。
the sound point out of numerous simple substances, that have a regular shape and surfaces arranged in very similar styles
These improvements contain exotic constructions with programmable lattice symmetries and perfectly-outlined crystal practices, responsive supplies that leverage the intrinsic Attributes of nucleic acids to manipulate buildings on demand, nanoparticle superlattices grown epitaxially from surfaces and colloidal crystals offering insights into gentle–make a difference interactions. Wanting ahead, we problem the community to leverage the amazing structural Regulate afforded by crystal engineering with DNA to synthesize lessons of purposeful materials that press over and above what is possible with naturally occurring crystalline resources or All those created by much more common techniques.
水碧：《山海经》中，水晶又被称作水碧： �?又南三百里，日耿山，无草木，多水碧 �?，郭璞注�?�?亦水玉类 ”。这种称谓常被文人所引用，晋代郭景纯《璞江赋》道�?�?鬼，水碧�?�?。水晶又有人称它叫玉瑛。《符瑞图》载�?美石似玉，水精谓之玉瑛也�?”
C2 [ U ] transparent glass of extremely premium quality, ordinarily with its surface Slash into sensitive patterns:
They may at some point make a good minimal uniform cluster of atoms, This can be the whole process of escalating crystals. The greater they might arrive with each other, the more of the formation will likely be noticeable on the naked eye. Researchers can figure out what mineral they are taking a look at by how the crystals variety.
解理：无解理。所谓解理是指矿物被打击时，沿一定方向有规则地裂开形成光滑平面的性质。根据解理的程度可以分为五类：极完全解理、完全解理、中等解理、不完全解理和无解理，水晶属于无解理。
如果水晶内部杂质中有传说中人物的造型，如佛、星座、生肖等价值可能要高于同等颜色和净度的水晶。
水晶是有成色等级之分，影响水晶价位的因素很多，不像钻石以4C就可以判定，所以大家要多听多看多比较才能真正辨别出来。一般的标准是水晶石越大越好，越透越好，颜色越娇嫩越好，形状越典型越好。不过最重要还是自己喜欢，而选购时辨识真伪的方法大致有下列几种：
⑤化学稳定�?非常好，在常温下仅溶解于氢氟酸，不溶解于其它各类酸、碱。在高温高压条件下可溶解于碳酸钠溶液中。
地质学家目前为止对晶洞形成还没有广泛认同的理论，但相信晶洞可以在任何埋藏的空腔内形成。这些空腔可以是火成岩中的气泡、树根下的空穴，甚至动物挖的地洞。经过漫长时间，空腔的外壁变硬，溶解的矽酸盐或方解石沉积到内壁。再经过漫长的时间，缓慢渗入的矿物使得晶体在空腔内部结晶。
You'll find other minerals and molecules that can type these crystal lattices. Snowflakes certainly are a vintage example of a roughly symmetric and geometrically patterned framework from ice crystals, and gemstones of all varieties are typically crystals.
This Review chronicles around here 20 years of analysis into developing a genetic code for crystal engineering. Instead of directing biological processes, this code employs synthetic sorts of DNA to programme the assembly of nanoparticles and microparticles into 1D, second and 3D crystalline architectures, in which just about each facet of the resultant buildings may be systematically controlled. Inside of this conceptual framework, the structural and practical advancements are explained in an effort to define the present degree of sophistication and to predict foreseeable future Instructions on the System.
crystal Alteration is variable: absent in many crystals, in Other folks manufacturing dense sericite aggregates which can show some recrystallization effects to provide coarser-grained white mica. From your Cambridge English Corpus The tridymite crystals are rectangular or wedge-shaped and are occasionally organized in aggregates. From your Cambridge English Corpus On top of that, haloarchaeal cells were embedded inside salt crystals below laboratory conditions and subsequently analysed by gentle microscopy. From your Cambridge English Corpus The white clouds (generally sparse) were also greatly viewed as becoming composed of little crystals of h2o ice, alternatively like cirrus inside our ambiance. Within the Cambridge English Corpus These are present in evaporite salt lakes and will be trapped in salt crystals for the duration of evaporation. With the Cambridge English Corpus As a result, the cells (organelles and membranes) are destroyed mechanically by ice crystals, leading to Demise by cell lysis. In the Cambridge English Corpus The crystals were being used in the 1st or next orders of reflection. From your Cambridge English Corpus Inside our 8xperiments, the crystals were cubes which has a foundation space of 8 e mm. From the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : outcome of temperature and force.