27Local economists have appeared into their crystal balls and viewed a little something alternatively 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》

Bismuth (Bi) appears being a steel, but the quantity of electrons obtainable for electrical conduction is comparable to that of semiconductors. In fact, bismuth is referred to as a semimetal. Molecular solids are usually crystals shaped from molecules or polymers. They can be insulating, semiconducting, or metallic, depending on the variety of molecules in the crystal. New molecules are repeatedly getting synthesized, and several are created into crystals. The quantity of distinctive crystals is enormous.

These innovations consist of unique structures with programmable lattice symmetries and properly-described crystal routines, responsive components that leverage the intrinsic properties of nucleic acids to govern constructions on demand from customers, nanoparticle superlattices grown epitaxially from surfaces and colloidal crystals that offer insights into light–subject interactions. Wanting forward, we challenge the Local community to leverage the extraordinary structural control afforded by crystal engineering with DNA to synthesize classes of functional materials that press over and above what has long been attainable with By natural means transpiring crystalline elements or People made by much more traditional procedures.

Fig. 3: A library of lattice symmetries is usually accessed by transforming the particle core and DNA get more info shell.

Crystalline structure is characterised by a geometric, repeating pattern of symmetric molecular construction. The arrangement of atoms sorts these requested, repeating styles.

Lattices may have one particular lattice position per cell or multiple, yielding a total of fourteen Bravais crystal lattice forms. Bravais lattices, named for physicist and crystallographer Auguste Bravais, describe the 3-dimensional array created by a list of discrete points.

光泽：玻璃光泽。断口处为油脂光泽。光泽，指宝石表面对光线反射的一种光学性质。观察水晶的光泽，可用手握着它，以灯光或窗户投进来的光线看表面反射，透明水晶亮度与光泽强弱有关。

发晶：无色、浅黄、浅褐等，可因含金红石常呈金黄、褐红等色，含电气石常呈灰黑色；含阳起石而呈灰绿色。

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�?。

广义的包裹体是指宝石内部含有的与主晶宝石化学成分、物理性质等不同的物质。

被主体水晶所捕获的包裹体。原生包裹体通常为固相，形态较规则。水晶中典型的原成包裹体有金红石、电气石、黄铁矿等，也会见到岩石碎屑或集合体。

Crystallography is the examine of crystals, and it promotions with everything from great geometric designs to seemingly random conglomerations of particles and minerals.

Crystals are categorized on the whole categories, such as insulators, metals, semiconductors, and molecular solids. One crystal of an insulator is usually transparent and resembles a bit of glass. Metals are shiny Unless of course they may have rusted. Semiconductors are occasionally shiny and in some cases clear but are hardly ever rusty. Numerous crystals is often categorised as a single sort of good, while others have intermediate behaviour. Cadmium sulfide (CdS) can be ready in pure type and is a superb insulator; when impurities are additional to cadmium sulfide, it gets an interesting semiconductor.

21You all know how whenever you have a crystal prism and go a beam of daylight by means of it, you obtain a spectrum, which seems like a ongoing band of rainbow hues.