Calcite crystals will often be Utilized in optical products, and in many cases the graphite in pencil lead are sheets of crystals that fundamentally crack aside layer by layer to write. Silica can sort silicate crystals which might be The premise for quartz, mica, olivine, and many other crystals and minerals.
Bismuth (Bi) appears to get a steel, but the number of electrons readily available for electrical conduction is analogous to that of semiconductors. In truth, bismuth is referred to as a semimetal. Molecular solids usually are crystals shaped from molecules or polymers. They can be insulating, semiconducting, or metallic, depending upon the variety of molecules while in the crystal. New molecules are repeatedly staying synthesized, and lots of are created into crystals. The volume of various crystals is big.
晶及其石英岩类玉石是中低档宝玉石，虽比不上钻石、红蓝宝石的高贵，但在加工中如果构思巧妙而且加工精细，同样具有很高的价值。如中国传统的玛瑙“虾盘”、“龙盘”、“水漫金山�?水胆玛瑙摆件)都被誉为国家级宝玉石。
Fig. 7: A template-directed approach can Command the placement of developing blocks over a surface area within the formation of complex buildings.
C2 [ U ] clear glass of pretty high-quality, typically with its surface area Slice into sensitive designs:
Lattices may have just one lattice stage for every mobile or more than one, yielding a total of fourteen Bravais crystal lattice types. Bravais lattices, named for physicist and crystallographer Auguste Bravais, describe the a few-dimensional array made by a set of discrete details.
Crystals appear distinctive from a number of other rocks and minerals, but �?barring a number of Exclusive instances �?almost all minerals conceal a crystalline structure underneath the surface.
As a incredibly hot Resolution cools or simply a saturated Resolution evaporates, particles attract near ample for chemical bonds to kind. Crystals also can type from deposition straight from the fuel stage. Liquid crystals have particles oriented in an structured method, like strong crystals, nevertheless have the ability to circulation.
包裹体常见有固相、固液气三相组合、空洞以及双晶、色带等。水晶中典型的同生包裹体有自形的锐钛矿、气液两相包体等。
[ C/U ] transparent glass of high quality, ordinarily with its Crystal area Slice into patterns that mirror light
16I opened the box and observed a bit of crystal snowflake along with a greeting card with "Happy Birthday" during 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。
正常的水晶在生长时，多可以发现和柱形尖端棱线平行的生长纹（growth lines）。由于在地底、岩洞中的生长空间多狭窄，尤其在遇到地震时，或地壳变动时，甚至容易遭到其他矿石的挤压，常常会压迫产生不同的「晶面」。还有，当水晶还是在液态状的时候，常常也会包覆着其他的矿石、泥灰一起结晶成长，如金红石（稍后变成发晶）、火山泥灰（稍后变成幻影水晶）等等。所有的这些，都是「自然的一部分」，请不要视为「瑕疵」。
压电性：水晶晶体受到压力时会产生电荷；反之，受到电压作用时，晶体会产生频率很高的振动。水晶具有可使压力与电荷相互转移的性能，称压电性。
水晶的价值根据品质、块体的大小、美感和产量多少的不同相差较大。遇到好的天然水晶要敢于下手，但好的水晶一般大家都想得到，值与不值，就要看经验了。由于天然水晶的开采和制作原因，没有瑕疵的水晶很难得到，纯净的饰品要达到与合成水晶媲美的品质，实在是很难得。另外，由于水晶的特性，在佩戴过程中，也会改变其等级，比如因为某种原因，有可能会逐渐产生较大裂纹。