对这类水晶晶簇观赏石的欣赏与评价,主要是强调晶体的完整、品种的名贵(如紫水晶、烟晶、发晶等)、造型奇特、含有名贵晶体(如辰砂、辉锑矿等)伴生等。晶簇产于矿床晶洞中,长相完美的并不多见,要完整无损地采集下来,又比较困难,故而采集起来代价较大,精品晶簇价值也就昂贵了。
Bismuth (Bi) appears to generally be a metallic, but the amount of electrons accessible for electrical conduction is similar to that of semiconductors. In truth, bismuth is called a semimetal. Molecular solids tend to be crystals shaped from molecules or polymers. They may be insulating, semiconducting, or metallic, with regards to the variety of molecules during the crystal. New molecules are continuously getting synthesized, and plenty of are created into crystals. The quantity of different crystals is enormous.
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。
Fig. 7: A template-directed solution can Regulate The position of creating blocks with a surface area within the development of sophisticated constructions.
2She was sporting a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
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水晶原石观赏石,从字面意义理解:观赏水晶石的原貌,即经过抛光去皮后的包裹体水晶和原色水晶,不需雕刻不求象形就具有非常高的观赏价值和收藏价值。此类水晶观赏石对质地要求非常之高,水晶晶体通透干净,颜色艳丽,意境鲜明深刻的价值就高,它的价值特点就好比钻石,实实在在石头本身的价值。
如果水晶内部杂质中有传说中人物的造型,如佛、星座、生肖等价值可能要高于同等颜色和净度的水晶。
水晶包裹体丰富多彩,从气体、液体到各种矿物质,甚至宝石,均可被包含于水晶内,各种包裹体所形成的景象更是变化万千。按照包裹体的内容,常把包裹体水晶分为一下八类:
多色�?无色水晶没有多色性。有色水晶有弱到强的多色�?表现为体色的不同深浅。
15The trick to a superb thermoelectric content is a crystal structure where electrons can flow freely.制造一种好的热电材料的关键是,需要一种电子可以自由流动的晶体结构。
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(development 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」。
水精:水晶为何称为水精,《广雅》有巧解:�?水之精灵�?”;李时珍则说:�?莹洁晶光,如水之精英 ”。细加考究,此称还蕴含浓厚的宗教意味呢。水精一名,最初见于佛书,后汉支曜翻译的《具光明定意经》说:�?其所行道,色如水�?�?。
The C60 molecules, also called buckyballs, are very potent and Practically incompressible. Crystals are formed these kinds of the balls are organized within an fcc lattice using a just one-nanometre spacing between the centres of adjacent balls. The very similar C70 molecule has The form of the rugby ball; C70 molecules also form an fcc crystal when stacked together. The good fullerenes variety molecular crystals, with weak binding—furnished by van der Waals interactions—among the molecules.