5 Simple Techniques For Crystal

5 Simple Techniques For Crystal

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27Local economists have looked into their crystal balls and observed a thing fairly awful.当地的经济学者们已预测到将会出现棘手的问题。《柯林斯英汉双解大词典》

A basic strategy in crystal buildings will be the unit cell. It's the smallest unit of volume that allows identical cells being arranged jointly to occupy all offered Area. The geometrical basis of all crystals will be the lattice. A lattice could be seen as an everyday and infinite arrangement of factors or atoms, exactly where Each individual issue or atom has A similar encompassing atmosphere.

发晶的价值取决于发的颜色、罕见性及大小，一般是发色鲜艳、块度大的价格高。水胆水晶的价值主要取决于水胆及晶体的大小、透明度的高低。如果水胆较大并有一定形态，便可加工成较为珍贵的工艺品。另外水胆中的水也有一定的科学研究价值，通过它们可了解几百万年前地球上水的成分及变化。

Insert to term listing Incorporate to word record C2 [ U ] clear glass of really high quality, commonly with its surface area cut into sensitive designs

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。

发晶，包括钛晶，铜顺发，绿发晶，黑发晶，银发晶，杂色发晶，其中钛晶最珍贵，少数钛晶价值可比钻石，红宝石和蓝宝石以及祖母绿。

Insert to term checklist Add to phrase record [ C/U ] transparent rock that looks like ice, or perhaps a bit of it

Crystals are very little more than an requested arrangement of molecules or atoms. Crystals are available here in a number of sizes and shapes, and each has unique attributes. What they are created of determines how it can variety.

第三种是“皮景”，因某些其他的矿物与水晶体共生，或由于其他的物质侵蚀而依附于水晶表面，或者是水晶受自然环境的影响，在水晶表面出现蚀象，形成了一些景象或图案，这种景观存在于水晶表面。

看文化：水晶里面的包裹体象形，能与文化、宗教及历史有所牵连的话，价格往往会比水晶本身的价值高出几倍甚至几百倍。

There are two this sort of probable periodic preparations. In Every, the primary layer has the atoms packed right into a airplane-triangular lattice in which each and every atom has 6 speedy neighbours. Determine two demonstrates this arrangement for the atoms labeled A

Molecular Crystals: Complete molecules are bonded to one another in an structured method. A fantastic example is often a sugar crystal, which contains sucrose molecules.

⑨、喷砂：立体感弱，较平整，无凹凸感，机器雕刻文字、图形等后进行效果处理。成本低制作快。

Binary crystals are present in several constructions. Some pairs of features variety multiple composition. At room temperature, cadmium sulfide could crystallize both while in the zinc blende or wurtzite composition. Alumina also has two feasible buildings at home temperature, α-alumina (corundum) and β-alumina. Other binary crystals show unique constructions at distinct temperatures. One of the most advanced crystals are These of silicon dioxide (SiO2), that has seven diverse buildings at a variety of temperatures and pressures; the commonest of these structures is quartz.