Calcite crystals in many cases are Employed in optical products, and even the graphite in pencil guide are sheets of crystals that fundamentally split aside layer by layer to write. Silica can type silicate crystals which are The premise for quartz, mica, olivine, and a number 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。

发晶的价值取决于发的颜色、罕见性及大小，一般是发色鲜艳、块度大的价格高。水胆水晶的价值主要取决于水胆及晶体的大小、透明度的高低。如果水胆较大并有一定形态，便可加工成较为珍贵的工艺品。另外水胆中的水也有一定的科学研究价值，通过它们可了解几百万年前地球上水的成分及变化。

养殖晶：养殖晶是指，用天然水晶做种子，然后赋予天然水晶生长的高压条件，养殖器中有富含二氧化硅的分子。然后二氧化硅分子围绕天然水晶种生长，这样的水晶成分（分子式）与天然水晶是一摸一样的，唯一有差别的是，这样的水晶磁场作用没有天然水晶强。

You can also find several elements that resemble crystals but are literally polycrystals. Polycrystals variety when microscopic crystals fuse collectively to form a sound. These elements tend not to consist of ordered lattices.

当二氧化硅结晶完美时就是水晶；结晶不完美的就是石英：二氧化硅胶化脱水后就是玛瑙；二氧化硅含水的胶体凝固后就成为蛋白石；二氧化硅晶粒小于几微米时，就组成玉髓、燧石、次生石英岩。

石英：《广雅》称水晶叫石英，色白如莹者又叫白。为附的异形字。司马相如《子虚赋》就�?�?雌黄�?�?之句。苏林解释：�?�?，白石英�?”。

Hexagonal �?Characterized by 4 axes, three of that are equal in size and intersect at 120 degrees, by using a fourth axis perpendicular to the opposite three.

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。

Crystals with apparent flat faces are called euhedral crystals, even though All those missing defined faces are named anhedral crystals. Crystals consisting of purchased arrays of atoms that are not normally periodic are named quasicrystals.

The essential units of solids are either atoms or atoms that have mixed into molecules. The electrons of an atom transfer in orbits that kind a shell framework within the nucleus. The shells are stuffed website in a systematic purchase, with each shell accommodating only a small amount of electrons. Diverse atoms have distinct quantities of electrons, which happen to be dispersed inside a characteristic electronic construction of stuffed and partially crammed shells.

Crystals are not just renowned for their Bodily appearance, but distinctive crystals of different resources and formations may result in a vast a number of makes use of and Bodily Qualities.

《古今小说·李公子救蛇获称心》：“器皿皆是玻璃、水晶、琥珀、玛瑙为之，曲尽巧妙，非人间所有。”

Fig. 5: The opportunity to comprehend outlined crystal practices is depending on the symmetry engineering approach.