5 Simple Techniques For Crystal
5 Simple Techniques For Crystal
Blog Article
Not all crystals are Similarly crystalline. There are often impurities, as well as ionic & covalent between molecules can generate vastly distinctive structures away from a similar materials. An awesome illustration of this are diamonds and graphene.
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。
结晶的形状非常细小,需要用显微镜才能看得清楚,外观上看起来是平滑、块状。常见最多的是各式玛瑙
看原料:选料精良的水晶制品,应看不到胶口及棉絮;质地纯净、光润、晶莹为好。
Crystalline framework is characterised by a geometric, repeating sample of symmetric molecular construction. The arrangement of atoms sorts these purchased, repeating designs.
, has the identical construction, but there are two choices for choosing the holes the atoms will occupy. The 3rd layer could be positioned in excess of the atoms of the initial layer, producing an alternate layer sequence A
Crystals search one of a kind from all kinds of other rocks and minerals, but �?barring a couple of Particular situations �?almost all minerals hide a crystalline composition underneath the floor.
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。
Meanwhile, to make certain continued assist, we've been exhibiting the website with out designs and JavaScript.
crystal The freshly crystallized quartz grains are characterized by elongate crystals oriented oblique to the shear band margins, defining a standard grain-shape foliation. 来自 Cambridge English Corpus We say the chain topology in the substantial w region functions because the proverbial ' scratch-on-theglass ' essential from the organic chemistry laboratory to create crystals. 来自 Cambridge English Corpus The age scatter among the person crystals may possibly replicate incorporation of xenocrysts from earlier magmatic pulses or protoliths. 来自 Cambridge English Corpus The clinopyroxene kinds neutral to pale brown, subhedral to anhedral crystals, occasionally made up of inclusions of plagioclase microlaths and opaque phases.
. The next layer is shaded within the determine. It has the exact same airplane-triangular composition; the atoms sit inside the holes formed by the initial layer. The very first layer has more info two equivalent sets of holes, though the atoms of the 2nd layer can occupy only one established. The 3rd layer, labeled C
Molecular Crystals: Whole molecules are bonded to one another in an arranged method. A fantastic illustration can be a sugar crystal, which contains sucrose molecules.
crystal, any reliable material during which the part atoms are arranged in the definite sample and whose surface regularity demonstrates its internal symmetry.
The C60 molecules, also known as buckyballs, are quite sturdy and almost incompressible. Crystals are shaped such that the balls are arranged in an fcc lattice which has a just one-nanometre spacing concerning the centres of adjacent balls. The related C70 molecule has The form of a rugby ball; C70 molecules also kind an fcc crystal when stacked together. The stable fullerenes variety molecular crystals, with weak binding—furnished by van der Waals interactions—concerning the molecules.