A strong is crystalline if it has extended-range get. Once the positions of the atom and its neighbours are acknowledged at a single position, the place of each atom is known specifically through the entire crystal. Most liquids deficiency long-variety get, Despite the fact that several have small-selection get. Shorter array is described as the first- or 2nd-closest neighbours of an atom. In lots of liquids the 1st-neighbour atoms are arranged in exactly the same framework as during the corresponding reliable stage.
A elementary concept in crystal structures could be the unit cell. It is the smallest unit of quantity that allows equivalent cells to get organized alongside one another to occupy all accessible space. The geometrical foundation of all crystals is definitely the lattice. A lattice is often viewed as a regular and infinite arrangement of points or atoms, where by Each individual level or atom has An analogous bordering environment.
一般而言，紫晶和黄晶是水晶中价值较高的品种。两者进一步的分级是据其颜色的深浅，颜色较深的为A级，稍浅的为B级。一般颜色较深的价格高，但要以不深暗为标准。颜色包括两种，一种是水晶本身的颜色，另一种是内部包裹体的颜色。水晶本身的颜色要艳丽、纯正，分布要均匀，不能太深或太浅，如澳州玉、蓝玉髓、紫晶、黄水晶，其价格就高。无色的水晶内含包裹体的颜色艳丽，其价格也高，如钛晶、绿幽灵、红兔毛。紫水晶一般以稍有云状物、颜色深紫、晶体通透的为上品。
The purchased interior composition of large crystals, such as fluorite and quartz demonstrated right here, is reflected inside their geometric styles.
Fig. four: Setting up blocks with distinctive styles and area chemistries direct the development of distinctive crystal symmetries.
第二种是“半包裹体”，在水晶结晶以后，由于受到地球引力的影响而产生的裂隙，晶体外的一些物质通过水晶的裂隙渗透到水晶内部，一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹，常被称为“通道”，这种包裹体所形成的景象相对地较受自然环境和时间的影响，相应的价值也比较�?。
根据包裹体和主晶宝石之间形成的先后关系可将水晶的包裹体划分以下三种类�?
1A crystal chandelier lit the area.一盏水晶吊灯照亮了房间。《柯林斯英汉双解大词典》
13Nearly all computers have a quartz-crystal clock to control their operation.几乎所有的计算机都有一个石英晶体时钟来调节它们的运行。
22Working from what The Crystal united states currently is familiar with about alone, the bureau's authorities as well as other demographers offer you an irresistible, if clouded, crystal ball among the their visions.
天然性是水晶观赏石的基本特性。通常整体造型水晶矿物不饰雕琢就具备很高的观赏价值，但是包裹体水晶观赏石经常需要适当打磨抛光，这样更方便观赏水晶内部的包裹体。
水晶形成后由于外力作用或某种人为原因使水晶产生大的裂隙或裂纹，这种裂纹有大有小，对水晶的影响也有大小之分。
Crystals are categorised usually classes, including insulators, metals, semiconductors, and molecular solids. One crystal of the insulator is generally transparent and resembles a piece of glass. Metals are shiny Until they've rusted. Semiconductors are occasionally shiny and sometimes clear but are by no means rusty. Many crystals is usually categorized as just one kind of strong, while others have intermediate behaviour. Cadmium sulfide (CdS) is usually ready in pure sort and is an excellent insulator; when impurities are additional to cadmium sulfide, it becomes an interesting semiconductor.
The C60 molecules, also known as buckyballs, are really solid and Virtually incompressible. Crystals are formed such the balls are arranged within an fcc lattice by 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 variety an fcc crystal when stacked together. The sound fullerenes kind molecular crystals, with weak binding—furnished by van der Waals interactions—among the molecules.