Not known Factual Statements About Crystal
Not known Factual Statements About Crystal
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27Local economists have looked into their crystal balls and viewed a thing somewhat unpleasant.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》
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。
A simple principle in crystal constructions is definitely the device mobile. It's the smallest device of volume that allows identical cells for being stacked collectively to fill all Room. By repeating the sample from the unit mobile over and over in all directions, your complete crystal lattice can be manufactured. A cube is the simplest example of a device cell. Two other examples are revealed in Determine 1. The primary will be the unit cell for the experience-centred cubic lattice, and the next is for your human body-centred cubic lattice. These buildings are defined in the following paragraphs.
Fig. 7: A template-directed strategy can Manage The location of developing blocks on the surface while in the development of intricate constructions.
There are actually many different crystals based upon geometric constructions, crystal progress, and materials. There is usually arrangements of hexagonal carbon atoms or amethyst which makes hexagonal pyramid structures.
SMART Vocabulary: relevant phrases and phrases Glass blower blowpipe bulletproof glass Minimize glass fibreglass frosted glassware glaze glazed glazier glazing prism prismatic punty Pyrex reglaze unglazed vitreous vitrification vitrify See more effects » It's also possible to uncover relevant phrases, phrases, and synonyms within the subjects:
30Three times went earlier, and I had been stunned to find out it again: the many openings were more info sewed up by slender and white thread and so they seemed such as the ice crystal on Winter season's branches in the north.
The elements are identified in a number of crystal packing arrangements. The most common lattice structures for metals are Those people obtained by stacking the atomic spheres into essentially the most compact arrangement.
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A crystal program refers back to the classification of crystals based upon the geometric arrangement and symmetry in their lattice structures. You'll find seven most important crystal methods:
用手去触摸水晶，天然水晶通常温度要比人造水晶的要凉的多；用眼观察，天然水晶通常有棉絮状的包裹体，这个是人造水晶所没有的。
水晶的价值还与块体大小有关，同样的颜色和净度级别，块越大越难得。有时候质量级别虽然低一些，但块体够大，也可能价格高于高级别的小晶体
玉石纹理如果能形成美丽的花纹、图案，其价格就高，如玛瑙内红白相间的色带有规律地排列，形成缠丝玛瑙时，碧玉中的不均匀颜色形成一种风景图案时，材料的价值将提高。当水晶内包裹体形成美丽的图案时，如幽灵水晶、风景水晶，或者针状包裹体呈束状排列时，其价值都高于普通的水晶。图案越美观、越有意境越好。
SMART Vocabulary: connected terms and phrases Geology: mineralogy beneficiation crystalline deposit gemologist gemology gold dust graphite idiomorphic intercrystalline like gold dust idiom magnesium mineral nugget pyrite quasicrystal seam silicon unmined vermiculite vulcanicity See additional success » You can even find related text, phrases, and synonyms in the topics: