The smart Trick of Crystal That No One is Discussing
The smart Trick of Crystal That No One is Discussing
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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。
A basic plan in crystal constructions would be the unit cell. It's the smallest device of quantity that permits similar cells to get arranged with each other to occupy all out there Place. The geometrical basis of all crystals is definitely the lattice. A lattice could be viewed as a daily and infinite arrangement of factors or atoms, in which Every issue or atom has an identical encompassing environment.
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
Most solid products located in nature exist in polycrystalline form as opposed to as one crystal. They are actually made up of countless grains (compact crystals) packed collectively to fill all House. Each individual specific grain has a different orientation than its neighbours. Even though lengthy-selection get exists within just a single grain, on the boundary involving grains, the buying variations way. A standard bit of iron or copper (Cu) is polycrystalline.
You can also find a lot of products that resemble crystals but are actually polycrystals. Polycrystals type when microscopic crystals fuse with each other to variety a sound. These products never include purchased lattices.
第二种是“半包裹体”，在水晶结晶以后，由于受到地球引力的影响而产生的裂隙，晶体外的一些物质通过水晶的裂隙渗透到水晶内部，一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹，常被称为“通道”，这种包裹体所形成的景象相对地较受自然环境和时间的影响，相应的价值也比较�?。
30Three days went past, and I was stunned to find out it all over again: the many openings were sewed up by skinny and white thread and they looked just like the ice crystal on winter's branches during the north.
26Some of the finest consuming Eyeglasses are constructed from guide crystal.一些最精致的酒杯是用铅晶质玻璃制成的。《柯林斯英汉双解大词典》
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。
Solids which have brief-assortment purchase but absence very long-range purchase are known as amorphous. Just about any product may be created amorphous by speedy solidification through the soften (molten condition). This ailment is unstable, along with the sound will crystallize in time. In the event the timescale for crystallization is years, then the amorphous point out seems secure.
Through the Cambridge English Corpus We are saying the chain topology inside the significant w region acts because the proverbial ' scratch-on-theglass ' necessary while in the natural chemistry laboratory to help make crystals. From the Cambridge English Corpus Constant-stress and temperature molecular-dynamics simulations of crystals with the lecithin fragments - glycerylphosphorylcholine and dilauroylglycerol. Within the Cambridge English Corpus In addition to these, dust particles have already been noticed in small-temperature plasmas, like These Employed in plasma processing and plasma crystals. Through the Cambridge English Corpus The ultimate Section of the e-book focuses on peculiarities of strongly coupled dusty plasmas, like the formation of dust crystals and connected appealing forces. From the Cambridge English Corpus Finish characterization of harm threshold in titanium doped sapphire crystals with nanosecond, picosecond, and femtosecond laser pulses. From your Cambridge English Corpus Unbroken crystals are euhedral; rounded, or even more irregular, primary morphologies weren't noticed. From the Cambridge English Corpus See all samples of crystal These examples are from corpora and from resources on the web. Any views in the examples never represent the viewpoint in the Cambridge Dictionary editors or of Cambridge College Push or its licensors.
The arrangement of the atom’s electrons determines its chemical Attributes. The Attributes of solids are frequently predictable within the Qualities in their constituent atoms and molecules, and different shell structures of atoms are for that reason accountable for the variety of solids.
压电性：水晶晶体受到压力时会产生电荷；反之，受到电压作用时，晶体会产生频率很高的振动。水晶具有可使压力与电荷相互转移的性能，称压电性。
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