Calcite crystals are frequently used in optical gear, and even the graphite in pencil lead are sheets of crystals that essentially break apart layer by layer to write down. Silica can form 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。
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
We've published about about 300 stones from the mineral kingdom! Read about Each individual stone's special origin, heritage, and energies under.
25If you are a Billy Crystal supporter, you'll appreciate this movie.如果你是比利·克里斯特尔的影迷，你就会喜欢这部电影。《柯林斯英汉双解大词典》
They may at some point generate a nice minor uniform cluster of atoms, This really is the entire process of escalating crystals. The more they might occur jointly, the more of the development will be noticeable on the bare eye. Experts can establish what mineral they are checking out by how the crystals form.
水晶与高档宝石的净度要求有很大不同。高档宝石稀少罕见，所以一般人们普遍对高档宝石的净度不会过于苛求。而水晶的产量着实大得惊人，所以通常人们会要求水晶净度越高越好，尽量避免有较明显的内含物的水晶。
②固体包裹体：指呈固态相存在包裹体，多因岩浆、热液、变质作用等形成的早期结晶物被水晶捕获而形成。
Many crystals behave like butter in that they're tough at very low temperatures but comfortable at higher temperatures. They are named solids in the least temperatures underneath their melting stage. A possible definition of the solid is an item that retains its shape if remaining undisturbed. The pertinent difficulty is how long the thing retains its condition. A remarkably viscous fluid retains its shape for an hour although not a yr. A sound ought to continue to keep its condition lengthier than that.
A crystal technique refers back to the classification of crystals according to the geometric arrangement and symmetry of their lattice constructions. You'll find 7 primary crystal methods:
The essential more info units of solids are both atoms or atoms that have merged into molecules. The electrons of an atom go in orbits that kind a shell construction round the nucleus. The shells are crammed in a systematic purchase, with Each and every shell accommodating only a little range of electrons. Diverse atoms have different quantities of electrons, that happen to be dispersed inside a characteristic electronic framework of crammed and partially stuffed shells.
There are actually other minerals and molecules that could type these crystal lattices. Snowflakes really are a traditional illustration of a roughly symmetric and geometrically patterned structure from ice crystals, and gemstones of all versions are generally crystals.
水玉：中国最古老的称法叫水玉，意谓似水之玉，又说是 �?千年之冰所�?�?。唐代诗人温庭筠《题李处士幽居》写道：�?水玉簪头白角巾，瑶琴寂历拂轻�?”。水玉一词最早频繁出于《山海经》：�?又东三百里，日堂庭之�?…�?多水�?”；�?丹山出焉，东南流注于洛水，其中多水玉 ”；�?逐水出焉，北流注于渭，其中多水玉 ”。司马相如《上林赋》曰�?�?水玉磊河 �?。水晶得名水玉，古人是看�?�?其莹如水，其坚如�?�?的质地。
Fig. five: A chance to know outlined crystal practices is dependent on the symmetry engineering solution.