New Step by Step Map For Crystal

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。

Bismuth (Bi) appears for being a metal, but the amount of electrons available for electrical conduction is comparable to that of semiconductors. The truth is, bismuth known as a semimetal. Molecular solids tend to be crystals fashioned from molecules or polymers. They may be insulating, semiconducting, or metallic, according to the form of molecules in the crystal. New molecules are continually getting synthesized, and plenty of are made into crystals. The quantity of diverse crystals is gigantic.

看做工：水晶制品加工过程分为两种，即磨工和雕工。如水晶项链、手链、耳环等属于研磨品；观音像、内画鼻烟壶等属于雕刻品。

看原料：选料精良的水晶制品，应看不到胶口及棉絮；质地纯净、光润、晶莹为好。

. These four constructions comprise the majority of the binary crystals with equal figures of cations and anions.

Monoclinic �?Characterised by 3 unequal axes, two of which intersect at an oblique angle, although the third is perpendicular into the plane of another two.

Springer Character continues to be neutral with regard to jurisdictional promises in printed maps and institutional affiliations.

Hexagonal �?Characterised by 4 axes, three of which can be equivalent click here in size and intersect at one hundred twenty degrees, that has a fourth axis perpendicular to the other 3.

本词条由中国科学院大学地球与行星科学学院、中国科学院地质与地球物理研究所 参与编辑并审核，经科普中国·科学百科认�?。

Solids that have small-variety buy but absence extensive-range order are referred to as amorphous. Just about any materials can be manufactured amorphous by swift solidification in the melt (molten point out). This issue is unstable, along with the sound will crystallize in time. If your timescale for crystallization is yrs, then the amorphous condition seems stable.

看孔眼：对于缀穿水晶制品（如项链、手链、佛珠），要看孔眼是否平直，孔的粗细是否均匀，有无细小裂纹。孔壁必须清澈透明，无“白痕”。

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（advancement lines）。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」。

This Critique chronicles more than 20 years of investigate into developing a genetic code for crystal engineering. As opposed to directing Organic procedures, this code uses artificial varieties of DNA to programme the assembly of nanoparticles and microparticles into 1D, 2D and 3D crystalline architectures, in which nearly every facet of the resultant constructions could be systematically managed. In this conceptual framework, the structural and practical improvements are explained in an effort to determine the current level of sophistication and to forecast long run directions on the platform.

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。