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。

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发晶的价值取决于发的颜色、罕见性及大小，一般是发色鲜艳、块度大的价格高。水胆水晶的价值主要取决于水胆及晶体的大小、透明度的高低。如果水胆较大并有一定形态，便可加工成较为珍贵的工艺品。另外水胆中的水也有一定的科学研究价值，通过它们可了解几百万年前地球上水的成分及变化。

诗中道出一段唐代由盛变衰的史实。玄宗末年，杨贵妃得宠，三姐妹并封为国夫人。他们养尊处优，奢华至极，仆人用水晶盘将珍馐佳肴端到宴席上，美人觉得没有口味，懒得动筷子。作为“诗圣”作为“史诗”，紫驼一段写饮食之精美，不空发议论，只尽情揭露事实，无一刺讥语，无一慨叹声，却使人于以外得之：此诗之善讽也。以史为鉴，这样的世道，这样的人物，国家不出“安史之乱”那样的大祸反倒不正常了。

There are actually many alternative crystals dependant upon geometric constructions, crystal development, and product. There might be arrangements of hexagonal carbon atoms or amethyst that makes hexagonal pyramid structures.

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Add to term record Incorporate to word list [ C/U ] clear rock that appears like ice, or maybe a piece of it

Hexagonal �?Characterised by four axes, three of which might be equal in length and intersect at a hundred and twenty levels, with a fourth axis perpendicular to one other a few.

Several crystals behave like butter in that they're tough at minimal temperatures but comfortable at greater temperatures. They are really called solids in any respect temperatures down below their melting issue. A attainable definition of the good can be an object that retains its shape if left undisturbed. The pertinent challenge is how much time the item keeps its form. A remarkably viscous fluid retains its condition for an hour but not a yr. A sound ought to maintain its shape more time than that.

22Working from what The usa currently understands about alone, the bureau's industry experts together with other demographers offer an irresistible, if clouded, crystal ball amid their visions.

16I opened the box and observed a piece of crystal snowflake in addition to a greeting card with "Pleased Birthday" within the blank paper.我打开盒子并看见在白纸中有一片水晶雪花和一张写着“生日快乐”的贺卡。

正常的水晶在生长时，多可以发现和柱形尖端棱线平行的生长纹（expansion traces）。由于在地底、岩洞中的生长空间多狭窄，尤其在遇到地震时，或地壳变动时，甚至容易遭到其他矿石的挤压，常常会压迫产生不同的「晶面」。还有，当水晶还是在液态状的时候，常常也会包覆着其他的矿石、泥灰一起结晶成长，如金红石（稍后变成发晶）、火山泥灰（稍后变成幻影水晶）等等。所有的这些，都是「自然的一部分」，请不要视为「瑕疵」。

The structure from the sodium atoms alone, or maybe the chlorine atoms on your own, is fcc and defines the unit mobile. The sodium chloride framework Therefore is created up of two interpenetrating fcc lattices. The cesium chloride lattice (Figure 3A) is based on the bcc composition; each and every other atom is cesium or chlorine. In this case, Crystal the device mobile is a cube. The third important construction for AB

矿物成分：针铁矿、赤铁矿、金红石、磁铁矿、电气石、石榴石、云母、绿泥石等形成了包裹体水晶，如发晶、钛晶、绿幽灵等，发晶中则含有肉眼可见的似头发状的针状矿物的包裹体形成。含锰和铁者称紫水晶；含铁�?；呈金黄色或柠檬�?)称黄水晶；含锰和钛呈玫瑰色者称蔷薇石英，即粉水晶；烟色者称烟水晶；褐色者称茶晶；黑色透明者称为墨晶。