轴性、光性：一轴晶正光性。正交偏光下所看到的一轴晶干涉图是独特的，其黑十字臂未达中心，形成中空的图案，俗称牛眼干涉图。中心部分通常为淡绿色或淡粉色。
23Sometimes, nevertheless, the crystal method of the silicate inclusions is observed to resemble a lot more intently The inner framework of diamond than that of other silicate minerals.然而，有时观察到硅酸盐包裹体的晶体形态比其他硅酸盐矿物更接近金刚石的内部结构。
天然水晶是不可再生资源，随着开发的深入，天然水晶存量已越来越少，为了可持续发展，东海县政府早就制定了保护本地资源，鼓励开发海外水晶资源的政策，但是，海外资源也越来越少，很多国家都提高了开采和出口天然水晶的门槛，进入东海市场的外国水晶价格连年暴涨，其中观赏水晶比普通水晶涨价更快。
Fig. three: A library of lattice symmetries might be accessed by transforming the particle Main and DNA shell.
C2 [ U ] clear glass of extremely top quality, ordinarily with its floor Slash into fragile designs:
These examples are from corpora and from resources on the web. Any viewpoints while in the illustrations will not symbolize the opinion of the Cambridge Dictionary editors or of Cambridge University Push or its licensors.
Crystals glance exclusive from all kinds of other rocks and minerals, but �?barring a couple of Particular instances �?nearly all minerals cover a crystalline framework beneath the surface area.
Skip to key information Thanks for visiting nature.com. You're using a browser version with constrained assist for CSS. To get the top practical experience, we advise you employ a more current browser (or change off compatibility mode in Web Explorer).
Crystals in many cases are viewed as one thing of enormous natural beauty, plus they are commonly made use of with diamonds or other stones to help make items of jewelry. Virtually all crystals now are man-built in laboratories.
The definition of the good appears obvious; a sound is generally considered currently being tricky and business. Upon inspection, nevertheless, the definition results in being considerably less simple. A dice of butter, as an example, is difficult after currently being stored in a very fridge and is also Evidently a solid. Immediately after remaining on the kitchen area counter for every day, the same cube turns into rather smooth, and it can be unclear Should the butter ought to nonetheless be considered a sound.
Solitary crystals of metals are smooth and malleable, while polycrystalline metals are harder and much better and are more practical industrially. Most polycrystalline products is often designed into substantial one crystals immediately after extended heat procedure. Up to now blacksmiths would warmth a piece of steel to make it malleable: warmth would make some grains expand large by incorporating more compact kinds. The smiths would bend the softened metal into form and then pound it awhile; the pounding would help it become polycrystalline again, raising its strength.
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。
crystal, any strong substance where the part atoms are arranged inside of a definite sample and whose surface area regularity reflects its interior symmetry.
crystal Alteration is variable: absent in many crystals, in Other folks creating dense sericite aggregates which may exhibit some recrystallization results to provide coarser-grained white mica. Through the Cambridge English Corpus The tridymite crystals are rectangular or wedge-shaped and are sometimes arranged in aggregates. From your Cambridge English Corpus Moreover, haloarchaeal cells ended up embedded inside of salt crystals underneath laboratory situations and subsequently analysed by light microscopy. With the Cambridge English Corpus The white clouds (normally sparse) had been also widely considered being made up of tiny crystals of drinking water ice, fairly like cirrus in our atmosphere. Through the Cambridge English Corpus They are present in evaporite salt lakes and will be trapped in salt crystals throughout evaporation. Within the Cambridge English Corpus Consequently, the cells (organelles and membranes) are ruined mechanically by ice crystals, bringing about Demise through cell lysis. From the Cambridge English Corpus The crystals had read more been Utilized in the primary or 2nd orders of reflection. From the Cambridge English Corpus Within our 8xperiments, the crystals were cubes by using a foundation area of eight e mm. In the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : outcome of temperature and tension.