The smart Trick of Crystal That No One is Discussing
The smart Trick of Crystal That No One is Discussing
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17These rings are indicative of the crystal framework of nickel and will be defined only by invoking wavelike properties of sunshine.这些光圈表明了了镍的晶体结构，而且只能通过光线中波的特征来解释。
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。
晶及其石英岩类玉石是中低档宝玉石，虽比不上钻石、红蓝宝石的高贵，但在加工中如果构思巧妙而且加工精细，同样具有很高的价值。如中国传统的玛瑙“虾盘”、“龙盘”、“水漫金山�?水胆玛瑙摆件)都被誉为国家级宝玉石。
Fig. seven: A template-directed approach can Management the placement of making blocks over a floor while in the formation of intricate buildings.
You will also find quite a few elements that resemble crystals but are literally polycrystals. Polycrystals form when microscopic crystals fuse collectively to kind a reliable. These components never include purchased lattices.
Not all crystals sort in h2o, but nearly all crystals variety the exact same way, atoms occur alongside one another and turn into a uniformed cluster. The procedure usually takes as minor as a couple of days to possibly a thousand years. Organic crystals that come from the Earth form a similar way.
水晶内部有多种矿物包裹体，形成的各种景观可以肉眼观测，这样的水晶就是包裹体水晶观赏石。由于水晶本身就是宝石，因此人们称誉包裹体水晶为“宝石级的观赏石”。包裹体水晶观赏石都具有独特性，具有极高欣赏和收藏价值。
Ionic Crystals: Electrostatic forces kind ionic bonds. A vintage example is actually a halite or salt crystal.
A lot of crystals behave like butter in that they're really hard at lower temperatures but smooth at larger temperatures. These are called solids in the least temperatures below their melting level. A feasible definition of the good is definitely an item that retains its shape if still left undisturbed. The pertinent problem is just how long the article keeps its shape. A hugely viscous fluid retains its shape for an hour or so but not a yr. A reliable must maintain its shape extended than that.
[ C/U ] transparent glass of high quality, normally with its surface Slash into patterns that mirror gentle
There are 2 this kind of achievable periodic preparations. In Each individual, the main layer has read more the atoms packed right into a plane-triangular lattice in which each and every atom has 6 instant neighbours. Determine 2 shows this arrangement with the atoms labeled A
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。
压电性：水晶晶体受到压力时会产生电荷；反之，受到电压作用时，晶体会产生频率很高的振动。水晶具有可使压力与电荷相互转移的性能，称压电性。
对于紫水晶黄水晶这样的单色水晶，通常要观察它的二色性，即使是最顶级的紫水晶黄水晶也是有色差的，通过这个方法可以鉴别是否加色。