The 5-Second Trick For Crystal
The 5-Second Trick For Crystal
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Calcite crystals are often Employed in optical machines, and even the graphite in pencil lead are sheets of crystals that fundamentally crack apart layer by layer to write. Silica can variety silicate crystals which can be the basis for quartz, mica, olivine, and all kinds of other crystals and minerals.
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。
Chemical Bonds The types of chemical bonds shaped among atoms or teams of atoms in crystals depend on their dimensions and electronegativity. You'll find four groups of crystals as grouped by their bonding:
Most good resources present in mother nature exist in polycrystalline variety as opposed to as just one crystal. They are actually made up of a lot of grains (tiny crystals) packed together to fill all Room. Every single specific grain has a different orientation than its neighbours. Even though extended-range buy exists inside a person grain, with the boundary among grains, the buying alterations way. A typical piece of iron or copper (Cu) is polycrystalline.
断口：贝壳状。断口也叫破口。它是指矿物被打击后产生不规则的破裂，破裂裂面凹凸不平称为断口。根据断口的形状可分为贝壳状和锯齿状。
, has a similar composition, but there are two options for choosing the holes that the atoms will occupy. The 3rd layer is usually positioned in excess of the atoms of the very first layer, making 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�?”。
11I cautiously opened the bundle 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。
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。
crystal The recently crystallized quartz grains are characterised by elongate crystals oriented oblique on the shear band margins, defining an average grain-condition foliation. 来自 Cambridge English Corpus We say the chain topology in the substantial w location acts because the proverbial ' scratch-on-theglass ' required within the natural chemistry laboratory to make crystals. 来自 Cambridge English Corpus The age scatter amid the individual crystals might mirror incorporation of xenocrysts from earlier magmatic pulses or protoliths. 来自 Cambridge English Corpus The clinopyroxene types neutral to pale brown, subhedral to anhedral crystals, sometimes containing inclusions of plagioclase microlaths and opaque phases.
. The next layer is shaded within the determine. It's more info got the identical aircraft-triangular composition; the atoms sit during the holes shaped by the 1st layer. The primary layer has two equivalent sets of holes, although the atoms of the next layer can occupy only one set. The 3rd layer, labeled C
The arrangement of the atom’s electrons establishes its chemical properties. The properties of solids are generally predictable from the Attributes in their constituent atoms and molecules, and the several shell structures of atoms are as a result liable for the range of solids.
Crystals are labeled normally categories, for example insulators, metals, semiconductors, and molecular solids. A single crystal of the insulator is often clear and resembles a bit of glass. Metals are shiny Until they may have rusted. Semiconductors are sometimes shiny and from time to time clear but are hardly ever rusty. A lot of crystals is usually classified as just one sort of stable, while others have intermediate behaviour. Cadmium sulfide (CdS) might be prepared in pure type and is an excellent insulator; when impurities are added to cadmium sulfide, it turns into a fascinating semiconductor.
Tetragonal �?Characterized by three mutually perpendicular axes, two of which are equal in duration, though the 3rd is lengthier or shorter and perpendicular to the other two.