Not all crystals are equally crystalline. There are often impurities, and the ionic & covalent among molecules can generate vastly various constructions outside of a similar content. A fantastic example of this are diamonds and graphene.
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。
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。
③次生包裹体：指主体水晶形成后，由于环境的变化使得主晶周围的一些物质沿裂隙进入到其内部而形成的包裹体。形成的原因有出熔作用、裂隙的结晶化、以及放射性元素破坏的作用等。水晶典型的次生包裹体有胶花水晶中的氧化铁充填物等。
Crystalline structure is characterised by a geometrical, repeating sample of symmetric molecular construction. The arrangement of atoms kinds these ordered, repeating patterns.
, has exactly the same structure, but There are 2 decisions for selecting the holes which the atoms will occupy. The 3rd layer might be positioned about the atoms of the primary layer, generating an alternate layer sequence A
石英：《广雅》称水晶叫石英，色白如莹者又叫白。为附的异形字。司马相如《子虚赋》就�?�?雌黄�?�?之句。苏林解释：�?�?，白石英�?”。
市场上有很多人把熔炼水晶也叫做合成水晶，那是不准确的，一般都是以水晶废料为原料在高温高压下熔炼出来的，而不是结晶成的，不具备水晶的晶体特性，所以不能把熔炼水晶与合成水晶混为一谈；但是熔炼水晶耐高温，用优质二氧化硅熔炼成的熔炼水晶可以做成实用产品比如水晶杯、烤盘、茶具等，实际上一代伟人毛泽东主席的水晶棺就是选用东海优质水晶熔炼而成的。
水晶常以晶簇、晶洞形式产出，其中水晶洞一般存在于由火山喷发而形成的巨厚熔岩流层的火成岩与玄武岩中。火山喷发时所含的气体或热水溶蚀等作用导致岩层中出现大量的孔隙，当富含硅质矿物的流体进入较薄的熔岩孔隙中，且温、压条件合适时将结晶沉淀出水晶等矿物。
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Through the Cambridge English Corpus We are saying the chain topology within the higher w region acts as being the proverbial ' scratch-on-theglass ' wanted while in the organic and natural chemistry laboratory to generate crystals. Through the Cambridge English Corpus Continual-strain and temperature molecular-dynamics simulations of crystals in the lecithin fragments - glycerylphosphorylcholine and dilauroylglycerol. In the Cambridge English Corpus Besides these, dust particles are observed in minimal-temperature plasmas, like Those people Employed in plasma processing and plasma crystals. From your Cambridge English Corpus The ultimate Component of the e book focuses get more info on peculiarities of strongly coupled dusty plasmas, including the formation of dust crystals and affiliated eye-catching forces. From the Cambridge English Corpus Comprehensive characterization of damage threshold in titanium doped sapphire crystals with nanosecond, picosecond, and femtosecond laser pulses. Through the Cambridge English Corpus Unbroken crystals are euhedral; rounded, or even more irregular, primary morphologies were not observed. With the Cambridge English Corpus See all samples of crystal These illustrations are from corpora and from sources on the internet. Any viewpoints within the examples tend not to depict the opinion in the Cambridge Dictionary editors or of Cambridge University Push or its licensors.
Crystal Lattices You can find 7 units of crystal buildings, that happen to be also referred to as lattices or space lattices:
crystal, any sound materials during which the element atoms are arranged in the definite pattern and whose surface regularity demonstrates its internal symmetry.
Binary crystals are found in many constructions. Some pairs of things type more than one composition. At place temperature, cadmium sulfide may well crystallize both within the zinc blende or wurtzite framework. Alumina also has two attainable constructions at area temperature, α-alumina (corundum) and β-alumina. Other binary crystals exhibit different buildings at diverse temperatures. Among the many most elaborate crystals are Individuals of silicon dioxide (SiO2), that has seven unique structures at various temperatures and pressures; the commonest of those structures is quartz.