Not known Factual Statements About Crystal
Not known Factual Statements About Crystal
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Not all crystals are equally crystalline. There are often impurities, and also the ionic & covalent in between molecules can build vastly unique structures from precisely the same materials. A terrific example of this are diamonds and graphene.
③、粗抛光：是将模具压出之毛胚，以金刚石盘直接磨出成品之刻线。④、细抛光：在粗抛光之后，以抛光粉来磨成品至晶莹剔透为止。
A essential thought in crystal constructions will be the unit cell. It is the smallest device of volume that allows similar cells to generally be stacked together to fill all Area. By repeating the sample with the unit cell over and over in all directions, your entire crystal lattice is often constructed. A dice is The only illustration of a device cell. Two other examples are shown in Determine one. The primary may be the device mobile for the facial area-centred cubic lattice, and the second is for just a system-centred cubic lattice. These buildings are defined in the subsequent paragraphs.
Significant crystals of diamond are precious gemstones. The crystal has other attention-grabbing Homes; it's the best seem velocity of any stable and is the best conductor of warmth. Moreover diamond, another widespread kind of carbon is graphite, which happens to be a layered material. Each and every carbon atom has a few coplanar in the vicinity of neighbours, forming an arrangement called the honeycomb lattice. Three-dimensional graphite crystals are acquired by stacking equivalent layers.
条痕颜色：无色。矿物粉末的颜色叫条痕。它可以消除假色，减弱他色，保留自色，是比矿物的颜色更为可靠的鉴定特征之一。
结晶�?When sea water is permitted to evaporate, salt crystals are deposited. 海水蒸发后，盐的结晶体就沉淀下来。
水晶原石观赏石，从字面意义理解：观赏水晶石的原貌，即经过抛光去皮后的包裹体水晶和原色水晶，不需雕刻不求象形就具有非常高的观赏价值和收藏价值。此类水晶观赏石对质地要求非常之高，水晶晶体通透干净，颜色艳丽，意境鲜明深刻的价值就高，它的价值特点就好比钻石，实实在在石头本身的价值。
发晶：无色、浅黄、浅褐等，可因含金红石常呈金黄、褐红等色，含电气石常呈灰黑色；含阳起石而呈灰绿色。
水晶是有成色等级之分，影响水晶价位的因素很多，不像钻石以4C就可以判定，所以大家要多听多看多比较才能真正辨别出来。一般的标准是水晶石越大越好，越透越好，颜色越娇嫩越好，形状越典型越好。不过最重要还是自己喜欢，而选购时辨识真伪的方法大致有下列几种：
⑤化学稳定�?非常好，在常温下仅溶解于氢氟酸，不溶解于其它各类酸、碱。在高温高压条件下可溶解于碳酸钠溶液中。
Through the Cambridge English Corpus We say the chain topology within the higher w area acts since the proverbial ' scratch-on-theglass ' essential from the natural chemistry laboratory to produce crystals. From your Cambridge English Corpus Continuous-strain and temperature molecular-dynamics simulations of crystals with the lecithin fragments - glycerylphosphorylcholine and dilauroylglycerol. With the Cambridge English Corpus As well as these, dust particles are actually observed in minimal-temperature plasmas, like People Utilized in plasma processing and plasma crystals. Through the Cambridge English Corpus The ultimate Element of the e-book focuses on peculiarities of strongly coupled dusty plasmas, like the development of dust crystals and connected eye-catching forces. Through the Cambridge English Corpus Total characterization of injury threshold in titanium doped sapphire crystals with nanosecond, picosecond, and femtosecond laser pulses. In the Cambridge English Corpus Unbroken crystals are euhedral; rounded, or more irregular, primary morphologies were not observed. In the Cambridge English Corpus See all samples of crystal These illustrations are from corpora and from resources online. Any opinions from the illustrations tend not to depict the opinion on the Cambridge Dictionary editors or of Cambridge College Push or its licensors.
Crystal Lattices You will discover seven systems of crystal constructions, that happen to be also known as lattices or House lattices:
水玉：中国最古老的称法叫水玉，意谓似水之玉，又说是 �?千年之冰所�?�?。唐代诗人温庭筠《题李处士幽居》写道：�?水玉簪头白角巾，瑶琴寂历拂轻�?”。水玉一词最早频繁出于《山海经》：�?又东三百里，日堂庭之�?…�?多水�?”；�?丹山出焉，东南流注于洛水，其中多水玉 ”；�?逐水出焉，北流注于渭，其中多水玉 ”。司马相如《上林赋》曰�?�?水玉磊河 �?。水晶得名水玉，古人是看�?�?其莹如水，其坚如�?�?的质地。
crystal Alteration is variable: absent in many crystals, in Many others developing dense sericite aggregates which can demonstrate some recrystallization consequences to provide coarser-grained white mica. From the Cambridge English Corpus The tridymite crystals are rectangular or wedge-shaped and are occasionally organized in aggregates. With the Cambridge English Corpus On top of that, haloarchaeal click here cells had been embedded within just salt crystals underneath laboratory ailments and subsequently analysed by gentle microscopy. In the Cambridge English Corpus The white clouds (ordinarily sparse) were being also broadly thought to be becoming made up of small crystals of drinking water ice, instead like cirrus in our atmosphere. With the Cambridge English Corpus They are located in evaporite salt lakes and might be trapped in salt crystals during evaporation. Through the Cambridge English Corpus Therefore, the cells (organelles and membranes) are destroyed mechanically by ice crystals, bringing about Dying by means of cell lysis. In the Cambridge English Corpus The crystals were being Utilized in the main or second orders of reflection. Within the Cambridge English Corpus In our 8xperiments, the crystals were cubes with a foundation space of 8 e mm. Through the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : influence of temperature and pressure.