The Definitive Guide to Crystal
The Definitive Guide to Crystal
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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。
Bismuth (Bi) appears for being a steel, but the quantity of electrons accessible for electrical conduction is comparable to that of semiconductors. In fact, bismuth is named a semimetal. Molecular solids are usually crystals fashioned from molecules or polymers. They can be insulating, semiconducting, or metallic, according to the sort of molecules in the crystal. New molecules are continuously currently being synthesized, and plenty of are created into crystals. The amount of various crystals is gigantic.
4Without a crystal ball, it's unattainable to state wherever we are going to be up coming yr.不用水晶球预卜未来，我们说不准明年处境如何呀。《牛津词典》
Incorporate to term list Add to term record C2 [ U ] clear glass of very good quality, ordinarily with its surface area Reduce into fragile styles
Crystalline composition is characterized by a geometric, repeating sample of symmetric molecular composition. The arrangement of atoms kinds these requested, repeating patterns.
Find out how the shape from the crystals establish the different minerals into familiesMinerals crystallize In line with certainly one of 7 motifs, often called crystal devices.
30Three times went previous, and I had been amazed to view it once again: all of the openings were sewed up by thin and white thread they usually seemed similar to the ice crystal on winter's branches within the north.
Crystals is often developed less than reasonable situations from all ninety two By natural means happening elements apart from helium, and helium is usually crystallized at small temperatures by making use of 25 atmospheres of stress.
Metallic Crystals: Metals usually type metallic crystals, the place some of the valence electrons are totally free to maneuver through the lattice. Iron, by way of example, can variety unique metallic crystals.
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。
看孔眼：对于缀穿水晶制品（如项链、手链、佛珠），要看孔眼是否平直，孔的粗细是否均匀，有无细小裂纹。孔壁必须清澈透明，无“白痕”。
There are just a few diverse unit-cell shapes, so many different crystals share just one device-mobile style. An important characteristic of a unit mobile is the volume of atoms it contains. The full range of atoms in all the crystal is definitely the range in Every single cell multiplied by the volume of unit cells. Copper and aluminum (Al) Every have just one atom for each unit cell, when zinc (Zn) and sodium chloride have two. Most crystals have only a few atoms per device cell, but there are many exceptions. Crystals of polymers, by way of example, have 1000s of atoms in Each individual unit mobile.
14For instance, Now we have Quartz crystal clocks and watches exact to in a person moment a yr.例如，我们使用的每年误差不超过1分钟的石英水晶钟表和手表。
crystal Alteration is variable: absent in lots of crystals, in others making dense sericite aggregates which can show some recrystallization effects to provide coarser-grained white mica. In the Cambridge English Corpus The tridymite crystals are rectangular or wedge-formed and are occasionally organized in aggregates. With the Cambridge English Corpus Moreover, haloarchaeal cells ended up embedded in salt crystals below laboratory disorders and subsequently analysed by light microscopy. From the Cambridge English Corpus The white clouds (usually sparse) were also greatly viewed as currently being composed of very small crystals of drinking water ice, alternatively like cirrus within our environment. From your Cambridge English get more info Corpus They are found in evaporite salt lakes and will be trapped in salt crystals for the duration of evaporation. From the Cambridge English Corpus Thus, the cells (organelles and membranes) are ruined mechanically by ice crystals, resulting in Dying by means of mobile lysis. From the Cambridge English Corpus The crystals had been Employed in the main or second orders of reflection. With the Cambridge English Corpus In our 8xperiments, the crystals were cubes which has a foundation region of 8 e mm. From the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : impact of temperature and pressure.