水晶表面坑洼的地方，有的深，有的浅，这是水晶在成长过程中自然形成的，并非是人为造成的损伤。缺陷位置本来包有其他矿物晶体，由于包裹体和水晶结合部位的结合力不强，当表面抛光时，矿体脱落，留下空位。这种缺陷在绿幽灵、钛晶、金发晶上都比较常见。
⒉棉、云雾或渣状包裹体、杂质在透明水晶内部有雾蒙蒙的现象或是感觉里面像有棉絮状、渣状物质一样的包裹体，这些包裹体的存在，影响水晶的整体美观。还有的水晶内局部含有黑斑或其他颜色的斑状物质，与水晶整体不协调，被视为水晶的杂质，有这种杂质的水晶是次品。
A standard notion in crystal constructions would be the unit mobile. It's the smallest device of volume that permits equivalent cells to generally be stacked together to fill all House. By repeating the sample of the device cell over and over in all Instructions, your complete crystal lattice may be made. A cube is the simplest illustration of a unit mobile. Two other illustrations are demonstrated in Determine one. The initial may be the unit cell for your deal with-centred cubic lattice, and the next is for a entire body-centred cubic lattice. These structures are explained in the next paragraphs.
In order to see how crystals are shaped, you could do some challenge inside your extremely have kitchen area and find out the formation in the crystals take place with all your own eyes . This may be accomplished by putting a small degree of table salt into some normal tap water, hold out 24 hours, and you may see great cubed formations. This comes about as the water is evaporating, which triggers the atoms that make up the salt (the mineral) as well as the h2o to come back nearer together.
In addition there are a lot of supplies that resemble crystals but are literally polycrystals. Polycrystals variety when microscopic crystals fuse together to type a good. These supplies don't consist of requested 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�?。
对任何宝石来说，颜色都是非常重要的，水晶也不例外。如果是水晶晶体是有颜色的，如粉水晶、黄水晶、紫水晶等，其颜色评价的最高标准则是明艳动人，不带有灰色、黑色、褐色等其他色调。如粉水晶，颜色以粉红为佳；紫水晶，要求颜色为鲜紫，纯净不发黑；黄水晶，要求颜色不含绿色、柠檬色调，以金橘色为佳。对于发晶来说，晶体的颜色也是很重要的。相同发丝的金发晶，晶体完全无色（白水晶）和晶体略偏茶色，肉眼的视觉观感也是有差别的，所以前者的价格会高于后者。
Hexagonal �?Characterized by four axes, a few of which can be equivalent in length and intersect at one hundred twenty degrees, that has a fourth axis perpendicular to the other three.
Q.4. What is the distinction between atomic composition and crystal construction? Ans. The main distinction between atomic framework and crystal composition lies in their definitions: atomic composition refers to how atoms are arranged inside of a solitary molecule click here or a cluster of molecules, whereas crystal framework worries the specific arrangement of atoms inside of a strong material.
22Working from what The usa previously is aware about alone, the bureau's industry experts and also other demographers present an irresistible, if clouded, crystal ball amid their visions.
Single crystals of metals are gentle and malleable, although polycrystalline metals are more difficult and more powerful and are more beneficial industrially. Most polycrystalline supplies can be built into significant one crystals after extended heat cure. Previously blacksmiths would warmth a piece of steel to make it malleable: warmth helps make a couple of grains mature massive by incorporating scaled-down types. The smiths would bend the softened metallic into form and after that pound it awhile; the pounding would make it polycrystalline again, expanding its energy.
隐晶类水晶外观是一块块的，不是成六角水晶簇状，但他们却也是属六方晶系的。但我们不能以肉眼观察到他们的六角形结晶，因为结晶的体积极为细小，需以显微镜协助下才能看到六角开结晶。而此类水晶非常平滑，因为结晶之间有“水化硅石”填补，玛瑙便属于此类。
/message /verifyErrors The word in the example sentence doesn't match the entry word. The sentence contains offensive material. Terminate Submit Thanks! Your feedback are going to be reviewed. #verifyErrors message
Tetragonal �?Characterised by 3 mutually perpendicular axes, two of that happen to be equivalent in duration, while the third is extended or shorter and perpendicular to one other two.