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。
按照透明度指标，水晶越透明，价格越高，好的透明的水晶加工出的成品晶莹剔透、光辉耀眼。透明度高的水晶能提升颜色的艳丽，否则显得呆板无灵性。光学水晶要求全透明、无双晶、无杂质。工艺水晶要求透明、少裂、少瑕疵。熔炼水晶要求透明，可有较多裂纹。三者价值依次降低，熔炼水晶只能作为熔炼水晶玻璃的原料。在工艺水晶中，晶体较大的，可用来做水晶眼镜和雕刻高档工艺品，因而价格较高。
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。
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�?”
There's also a lot of resources that resemble crystals but are actually polycrystals. Polycrystals kind when microscopic crystals fuse alongside one another to form a sound. These elements don't include ordered lattices.
, has the identical framework, but There are 2 alternatives for selecting the holes the atoms will occupy. The third layer could be put about the atoms of the primary layer, making an alternate layer sequence A
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Crystals are almost nothing in excess of an purchased arrangement of molecules or atoms. Crystals are available in many various styles and sizes, and each has different features. The things they are created of establishes how it will form.
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�?。
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。
Single crystals of metals are comfortable and malleable, whilst polycrystalline metals are more challenging and much better and tend to be more handy industrially. Most polycrystalline components is often designed into significant solitary crystals right after extended warmth treatment. In the past blacksmiths would heat a bit of metallic to really make it malleable: warmth tends to make a number of grains develop substantial by incorporating scaled-down kinds. The smiths would bend the softened steel into form and then pound it awhile; the pounding would ensure it is polycrystalline once more, expanding its power.
Fig. one: Schematic of crystal development from constructing blocks made up of a particle Main as well as a shell of DNA ligands attached into the particle area.
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crystal Alteration is variable: absent in several crystals, in others generating dense sericite aggregates which can clearly show some recrystallization consequences to provide coarser-grained white get more info mica. Within the Cambridge English Corpus The tridymite crystals are rectangular or wedge-formed and are sometimes organized in aggregates. From your Cambridge English Corpus In addition, haloarchaeal cells were embedded in salt crystals beneath laboratory ailments and subsequently analysed by light microscopy. With the Cambridge English Corpus The white clouds (normally sparse) were being also greatly thought to be staying made up of little crystals of h2o ice, somewhat like cirrus inside our atmosphere. With the Cambridge English Corpus They're present in evaporite salt lakes and will be trapped in salt crystals during evaporation. Within the Cambridge English Corpus As a result, the cells (organelles and membranes) are ruined mechanically by ice crystals, leading to Dying as a result of mobile lysis. From the Cambridge English Corpus The crystals were being Utilized in the very first or 2nd orders of reflection. Through the Cambridge English Corpus In our 8xperiments, the crystals have been cubes with a foundation place of eight e mm. Within the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : effect of temperature and force.