A Simple Key For Crystal Unveiled

27Local economists have seemed into their crystal balls and witnessed a little something alternatively awful.当地的经济学者们已预测到将会出现棘手的问题。《柯林斯英汉双解大词典》

A elementary plan in crystal constructions could be the device mobile. It's the smallest device of quantity that enables equivalent cells to generally be organized alongside one another to occupy all available Room. The geometrical basis of all crystals is the lattice. A lattice can be considered as a daily and infinite arrangement of points or atoms, in which each issue or atom has An analogous bordering ecosystem.

A primary strategy in crystal buildings may be the device cell. It's the smallest unit of quantity that allows similar cells to become stacked together to fill all Place. By repeating the sample of your unit cell over and over in all directions, the complete crystal lattice may be made. A dice is The best example of a unit cell. Two other examples are shown in Determine 1. The 1st will be the device mobile for your facial area-centred cubic lattice, and the next is for the overall body-centred cubic lattice. These structures are stated in the next paragraphs.

Fig. seven: A template-directed approach can control The position of developing blocks on the floor while in the formation of elaborate Crystal structures.

There's also numerous elements that resemble crystals but are actually polycrystals. Polycrystals kind when microscopic crystals fuse with each other to kind a sound. These materials never encompass ordered lattices.

Learn how The form from the crystals decide the different minerals into familiesMinerals crystallize In accordance with one of seven motifs, referred to as crystal systems.

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。

1A crystal chandelier lit the place.一盏水晶吊灯照亮了房间。《柯林斯英汉双解大词典》

本词条由中国科学院大学地球与行星科学学院、中国科学院地质与地球物理研究所 参与编辑并审核，经科普中国·科学百科认�?。

[ C/U ] clear glass of top of the range, typically with its surface area Minimize into styles that replicate light-weight

Solitary crystals of metals are tender and malleable, although polycrystalline metals are tougher and stronger and tend to be more useful industrially. Most polycrystalline supplies may be created into substantial one crystals after prolonged warmth cure. In past times blacksmiths would heat a piece of metal to really make it malleable: heat would make several grains develop huge by incorporating smaller kinds. The smiths would bend the softened steel into condition and afterwards pound it awhile; the pounding would ensure it is polycrystalline again, expanding its strength.

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水玉：中国最古老的称法叫水玉，意谓似水之玉，又说是 �?千年之冰所�?�?。唐代诗人温庭筠《题李处士幽居》写道：�?水玉簪头白角巾，瑶琴寂历拂轻�?”。水玉一词最早频繁出于《山海经》：�?又东三百里，日堂庭之�?…�?多水�?”；�?丹山出焉，东南流注于洛水，其中多水玉 ”；�?逐水出焉，北流注于渭，其中多水玉 ”。司马相如《上林赋》曰�?�?水玉磊河 �?。水晶得名水玉，古人是看�?�?其莹如水，其坚如�?�?的质地。

Tetragonal �?Characterised by 3 mutually perpendicular axes, two of which are equal in length, even though the third is extended or shorter and perpendicular to the opposite two.