Not known Facts About Crystal
Not known Facts About Crystal
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看颜色：即使在同一种类的水晶中，它的不同部位的纹理、色泽也各式各有千秋。属于单色的，要色度均匀；在同一块水晶上有深浅的，则要求其色调纹路美观大方。
①压电效�?在机械力(压力或拉�?作用下，水晶单晶体的两端会产生电荷，其电量相等但符号相反。在工业上，无色、无缺陷、不具双晶的水晶常被用来作压电石英片。
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。
水碧：《山海经》中，水晶又被称作水碧： �?又南三百里，日耿山，无草木，多水碧 �?，郭璞注�?�?亦水玉类 ”。这种称谓常被文人所引用，晋代郭景纯《璞江赋》道�?�?鬼，水碧�?�?。水晶又有人称它叫玉瑛。《符瑞图》载�?美石似玉，水精谓之玉瑛也�?”
There's also lots of products that resemble crystals but are actually polycrystals. Polycrystals form when microscopic crystals fuse jointly to sort a stable. These resources tend not to consist of requested lattices.
无色水晶与无色长石因折射率和密度十分接近故较难区分。主要方法是放大检查。长石有两组极完全解理，显微镜下可见两组解理相交而成的“娱蛤状”包裹体或细直的纹理，而水晶则无解理发育，仅有时可见断续不规则的裂理。
Incorporate to phrase list Increase to term list [ C/U ] clear rock that looks like ice, or even a piece of it
The weather are uncovered in many different crystal packing preparations. The commonest lattice structures for metals are All those received by stacking the atomic spheres into one of the most compact arrangement.
Several crystals behave like butter in that they are difficult at reduced temperatures but tender at greater temperatures. These are named solids at all temperatures underneath their melting level. A possible definition of a reliable is an object that retains its form if remaining undisturbed. The pertinent issue is how long the article retains its form. A really viscous fluid retains its form for an hour or so but not a year. A good need to preserve its shape for a longer period than that.
A crystal process refers to the classification of crystals depending on the geometric arrangement and symmetry in their lattice constructions. There are 7 key crystal methods:
地质学家目前为止对晶洞形成还没有广泛认同的理论，但相信晶洞可以在任何埋藏的空腔内形成。这些空腔可以是火成岩中的气泡、树根下的空穴，甚至动物挖的地洞。经过漫长时间，空腔的外壁变硬，溶解的矽酸盐或方解石沉积到内壁。再经过漫长的时间，缓慢渗入的矿物使得晶体在空腔内部结晶。
There are other minerals and molecules which will variety these crystal lattices. Snowflakes are a vintage illustration of a around symmetric and geometrically patterned structure from ice crystals, and gemstones of all versions are usually crystals.
在透明的水晶中，隐裂纹呈亮晶晶的片状，有时还会有晕彩效应。这些裂纹是水晶在生长过程中，遇到外力挤压而在内部产生的一些隐形裂纹，隐裂纹在芙蓉石、紫水晶、白水晶球及白水晶柱中都很常见。有的裂纹后来被物质填充，形成愈合的裂纹，也就是原来的裂纹又长住了。这种裂纹对水晶的影响相对要小一些。
Yet another form of crystalline carbon is based on a molecule with sixty carbon atoms referred to as buckminsterfullerene (C60). The molecular form is spherical. Each individual carbon is bonded to 3 neighbours, as in graphite, along with the read more spherical condition is attained by a combination of 12 rings with 5 sides and 20 rings with 6 sides. Identical structures have been initially visualized by the American architect R. Buckminster Fuller for geodesic domes.