Crystal Can Be Fun For Anyone
其它描述：《庶物异名疏》中说： �?水精出大秦国，一名黎�?�?。结晶完整的水晶晶体，就如参差交错的马齿，所以人们又叫它马牙石。先民们最早用它研磨成眼镜片，因而送它一个眼镜石的绰号。水晶有通称，也有俗称。广州一带称水晶叫晶玉，又名鱼脑冻；江苏东海县山民发现水晶会 �?窜火�?�?，于是给它起个放光石的俗名。世间一物多名，不足为奇，而像水晶拥有这么多的别称，实不多见。瞧，从水玉、水碧、白玉、玉瑛、水精石英、黎难、晶玉到菩萨石、马牙石、眼镜石、放光石、千年冰、高山冻、鱼脑冻等等，简直构成一部奇石鉴赏史。无色水晶以晶莹美丽、洁净透明着称。衡量无色水晶主要看它的纯度，越纯、越透明越好。干净的、无瑕疵的、杂质少的价值就高。无色的水晶如果很脏，就没有利用价值。
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。
Huge crystals of diamond are worthwhile gemstones. The crystal has other appealing Qualities; it's the very best audio velocity of any sound and is the greatest conductor of warmth. In addition to diamond, one other widespread form of carbon is graphite, which can be a layered substance. Every single carbon atom has 3 coplanar in close proximity to neighbours, forming an arrangement called the honeycomb lattice. 3-dimensional graphite crystals are acquired by stacking comparable levels.
C2 [ U ] clear glass of quite good quality, normally with its area Slash into sensitive designs:
结晶�?When sea drinking water is permitted to evaporate, salt crystals are deposited. 海水蒸发后，盐的结晶体就沉淀下来。
30Three days went past, and I had been amazed to check out it all over again: all of the openings were being sewed up by slender and white thread plus they appeared such as the ice crystal on Wintertime's branches while in the north.
1A crystal chandelier lit the room.一盏水晶吊灯照亮了房间。《柯林斯英汉双解大词典》
Crystals in many cases are considered as a thing of enormous elegance, plus they are generally employed with diamonds or other stones to help make items of jewelry. Nearly all crystals now are guy-manufactured in laboratories.
幽灵水晶，分绿幽灵，红幽灵，白幽灵等，主要组成为绿泥石，其中绿幽灵属于珍贵品种。
There's two these kinds of achievable periodic preparations. In Every single, the first layer has the atoms packed into a airplane-triangular lattice in which each and every atom has six fast neighbours. Determine 2 displays this arrangement for that atoms labeled A
You will find just a few distinct unit-cell styles, so a number of crystals share a single device-mobile type. An essential attribute of the device cell is the amount of atoms it incorporates. The overall number of atoms in the whole crystal may be the selection in Every cell multiplied by the number of device cells. Copper and aluminum (Al) Every single have a person atom for every unit cell, while zinc (Zn) and sodium chloride have two. Most crystals have only some atoms for every unit mobile, but there are several exceptions. Crystals of polymers, by way of example, have thousands of atoms in Every device cell.
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Binary crystals are present in numerous structures. Some pairs of elements sort more than one construction. At home temperature, cadmium sulfide may possibly crystallize both during the zinc blende or wurtzite framework. Alumina also has two doable structures at area temperature, α-alumina (corundum) and β-alumina. Other binary crystals show distinct buildings at different temperatures. One of the most intricate crystals are those of silicon dioxide (SiO2), which has seven distinctive structures at different temperatures and pressures; the most typical of these more info constructions is quartz.