Calcite crystals in many cases are used in optical products, and even the graphite in pencil direct are sheets of crystals that in essence split apart layer by layer to jot down. Silica can form silicate crystals which are The premise for quartz, mica, olivine, and many other crystals and minerals.
23Sometimes, on the other hand, the crystal kind of the silicate inclusions is observed to resemble far more carefully The inner construction of diamond than that of other silicate minerals.然而，有时观察到硅酸盐包裹体的晶体形态比其他硅酸盐矿物更接近金刚石的内部结构。
结晶的形状非常细小，需要用显微镜才能看得清楚，外观上看起来是平滑、块状。常见最多的是各式玛瑙
Tetragonal: These crystals kind prisms and double pyramids. The composition is like a cubic crystal, other than a person axis is for a longer time than the opposite.
. These four structures comprise most of the binary crystals with equivalent quantities of cations and anions.
Lattices could possibly have 1 lattice point per mobile or more than one, yielding a total of fourteen Bravais crystal lattice styles. Bravais lattices, named for physicist and crystallographer Auguste Bravais, explain the three-dimensional array produced by a list of discrete points.
水晶的评价标准和高端宝石有所不同。多数高端宝石把颜色放在评价的第一位，而对水晶来说，颜色和净度（水晶行业称作晶体）是近乎同等重要的因素：
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。
仿制钛晶树水晶：钛晶是水晶里价格最昂贵的，造假者当然也不会放过这么好的产品。天然的环境下，在水晶里能生长个像树一样的钛晶，完全是可能的，只是这样的货很少，那我们的造假专家是如何做的呢，白水晶底下打个洞，激光打点成板状的钛晶进去，就这样这块水晶的身价就能飙升几十倍。往往有的钛晶戒面，会采用将钛晶部位割成板状，与圆面的水晶粘合的方法来制作。
crystal The freshly crystallized quartz grains are characterised by elongate crystals oriented oblique to the shear band margins, defining a normal grain-shape foliation. 来自 Cambridge English Corpus We are saying the chain topology during the superior w region functions as being the proverbial ' scratch-on-theglass ' necessary during the organic chemistry laboratory for making crystals. 来自 Cambridge English Corpus The age scatter among the individual crystals may perhaps reflect incorporation of xenocrysts from before magmatic pulses or protoliths. 来自 Cambridge English Corpus The clinopyroxene types neutral to pale brown, subhedral to anhedral crystals, often that contains inclusions of plagioclase microlaths and opaque phases.
16I opened the box and more info noticed a piece of crystal snowflake along with a greeting card with "Delighted Birthday" in 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 a few different unit-mobile shapes, so a number of crystals share an individual device-cell style. An essential characteristic of the device cell is the number of atoms it consists of. The whole number of atoms in the entire crystal would be the amount in each cell multiplied by the quantity of device cells. Copper and aluminum (Al) Just about every have just one atom for each unit mobile, while zinc (Zn) and sodium chloride have two. Most crystals have only some atoms for every unit mobile, but there are some exceptions. Crystals of polymers, for instance, have A huge number of atoms in Each and every unit cell.
Crystals are categorized generally classes, like insulators, metals, semiconductors, and molecular solids. Only one crystal of the insulator is generally clear and resembles a bit of glass. Metals are shiny unless they've rusted. Semiconductors are sometimes shiny and at times transparent but are never ever rusty. Many crystals might be labeled as only one kind of stable, while some have intermediate conduct. Cadmium sulfide (CdS) could be geared up in pure form and is a wonderful insulator; when impurities are included to cadmium sulfide, it turns into a fascinating semiconductor.
This crystal construction is accountable for the exclusive Actual physical and chemical properties of sodium chloride, which includes its high melting point, electrical conductivity, and talent to form ionic bonds effortlessly.