Detailed Notes on Crystal
Detailed Notes on Crystal
Blog Article
Not all crystals are Similarly crystalline. There are sometimes impurities, along with the ionic & covalent amongst molecules can develop vastly various constructions away from exactly the same substance. A great example of this are diamonds and graphene.
杂质、裂纹越少越好。质地好的水晶制品，应看不到星点状、云雾状和絮状分布的气液包裹体或组成玉石的颗粒。有裂纹、斑点，则属于次品。
Chemical Bonds The kinds of chemical bonds shaped between atoms or teams of atoms in crystals count on their size and electronegativity. You will discover four types of crystals as grouped by their bonding:
Fig. 7: A template-directed tactic can Handle the placement of setting up blocks with a surface inside the formation of complicated constructions.
How Crystals Form The entire process of forming a crystal is called crystallization. Crystallization normally takes place every time a good crystal grows from the liquid or Option.
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。
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。
Crystals are absolutely nothing much more than an requested arrangement of molecules or atoms. Crystals come in a number of shapes and sizes, and each has diverse qualities. What they are created of establishes how it is going to variety.
仿制钛晶树水晶：钛晶是水晶里价格最昂贵的，造假者当然也不会放过这么好的产品。天然的环境下，在水晶里能生长个像树一样的钛晶，完全是可能的，只是这样的货很少，那我们的造假专家是如何做的呢，白水晶底下打个洞，激光打点成板状的钛晶进去，就这样这块水晶的身价就能飙升几十倍。往往有的钛晶戒面，会采用将钛晶部位割成板状，与圆面的水晶粘合的方法来制作。
The definition of a stable appears noticeable; a good is usually regarded as remaining difficult and business. On inspection, having said that, the definition becomes fewer uncomplicated. A cube of butter, as an example, is hard just after currently being stored in a very refrigerator and is also Plainly a sound. Soon after remaining about the kitchen area counter for a day, precisely the same cube gets to be quite delicate, and it can be unclear In case the butter must continue to be regarded as a solid.
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”。
国家还并未给天然水晶提供一个等级划分的具体标准，水晶品种繁杂，每一品种都有他不同的评判标准。
Crystals are categorized on the whole types, such as insulators, metals, semiconductors, get more info and molecular solids. Just one crystal of an insulator is usually clear and resembles a piece of glass. Metals are shiny Until they've rusted. Semiconductors are sometimes shiny and occasionally clear but are never ever rusty. Quite a few crystals is often categorised as one style of strong, while others have intermediate conduct. Cadmium sulfide (CdS) is often prepared in pure kind and is a superb insulator; when impurities are additional to cadmium sulfide, it will become an interesting semiconductor.
Binary crystals are present in quite a few structures. Some pairs of factors kind multiple construction. At room temperature, cadmium sulfide might crystallize both in the zinc blende or wurtzite composition. Alumina also has two possible constructions at area temperature, α-alumina (corundum) and β-alumina. Other binary crystals exhibit distinct structures at distinct temperatures. Among the most advanced crystals are Individuals of silicon dioxide (SiO2), which has 7 distinctive buildings at various temperatures and pressures; the commonest of these buildings is quartz.