Calcite crystals are sometimes Employed in optical devices, and in many cases the graphite in pencil lead are sheets of crystals that fundamentally split aside layer by layer to write down. Silica can variety silicate crystals that are The premise for quartz, mica, olivine, and all kinds of other crystals and minerals.
杂质、裂纹越少越好。质地好的水晶制品，应看不到星点状、云雾状和絮状分布的气液包裹体或组成玉石的颗粒。有裂纹、斑点，则属于次品。
对水晶进行评价主要依据其颜色、透明度、大小、净度、特殊图案及是否有光学效应等方面。以颜色纯正，浓度较高，内部无瑕为好。种类上紫晶最贵，其次为黄晶、烟晶、无色水晶和芙蓉石。有特殊光学效应的水晶的价格更高。
水碧：《山海经》中，水晶又被称作水碧： �?又南三百里，日耿山，无草木，多水碧 �?，郭璞注�?�?亦水玉类 ”。这种称谓常被文人所引用，晋代郭景纯《璞江赋》道�?�?鬼，水碧�?�?。水晶又有人称它叫玉瑛。《符瑞图》载�?美石似玉，水精谓之玉瑛也�?”
2She was wearing a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
发晶，包括钛晶，铜顺发，绿发晶，黑发晶，银发晶，杂色发晶，其中钛晶最珍贵，少数钛晶价值可比钻石，红宝石和蓝宝石以及祖母绿。
Crystals search distinctive from a number of other rocks and minerals, but �?barring a couple of Specific circumstances �?nearly all minerals conceal a crystalline construction underneath the surface.
Crystals is often grown beneath moderate ailments from all ninety two By natural means developing elements except helium, and helium can be crystallized at low temperatures by utilizing twenty five atmospheres of pressure.
第三种是“皮景”，因某些其他的矿物与水晶体共生，或由于其他的物质侵蚀而依附于水晶表面，或者是水晶受自然环境的影响，在水晶表面出现蚀象，形成了一些景象或图案，这种景观存在于水晶表面。
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16I opened the box and saw a piece of crystal snowflake in addition to a greeting card with "Pleased Birthday" from the blank paper.我打开盒子并看见在白纸中有一片水晶雪花和一张写着“生日快乐”的贺卡。
You'll find only some distinct unit-mobile shapes, so numerous crystals share a single unit-cell variety. A crucial attribute of a unit mobile is the number of atoms it contains. The entire variety of atoms in your complete crystal will be the range in Just about every cell multiplied by the volume of unit cells. Copper and aluminum (Al) Each and every have one atom per unit cell, though zinc (Zn) and sodium chloride have two. Most crystals have just a few atoms per device cell, but there are several exceptions. Crystals of polymers, as an example, have 1000s of atoms in each unit mobile.
crystal, any solid content during which the component atoms are organized in a very definite pattern and whose area regularity demonstrates its interior symmetry.
crystal Alteration is variable: absent in lots of crystals, in Many others creating dense sericite aggregates which may show some recrystallization website consequences to make coarser-grained white mica. From your Cambridge English Corpus The tridymite crystals are rectangular or wedge-formed and are occasionally arranged in aggregates. In the Cambridge English Corpus Furthermore, haloarchaeal cells ended up embedded in salt crystals beneath laboratory problems and subsequently analysed by gentle microscopy. Through the Cambridge English Corpus The white clouds (typically sparse) were being also greatly considered being made up of little crystals of drinking water ice, instead like cirrus within our atmosphere. In the Cambridge English Corpus They are really located in evaporite salt lakes and might be trapped in salt crystals in the course of evaporation. From the Cambridge English Corpus Therefore, the cells (organelles and membranes) are wrecked mechanically by ice crystals, bringing about Dying via cell lysis. From your Cambridge English Corpus The crystals were used in the very first or 2nd orders of reflection. From the Cambridge English Corpus Within our 8xperiments, the crystals ended up cubes which has a base area of 8 e mm. In the Cambridge English Corpus Vibration-assisted intermolecular hydrogen tunneling in photoreactive doped molecular crystals : effect of temperature and force.