Calcite crystals are sometimes used in optical equipment, and also the graphite in pencil direct are sheets of crystals that effectively crack aside layer by layer to jot down. Silica can type silicate crystals which happen to be the basis for quartz, mica, olivine, and many other crystals and minerals.
水晶原石观赏石充分体现了天然水晶的本质，经过抛光的水晶原石观赏石，玲珑剔透、晶莹璀璨，独具匠心的设计，恰到好处地显露出水晶的魅力。如果您想单纯的欣赏水晶，水晶原石观赏石是你的不二之选，给人一种返璞归真的感觉。
Chemical Bonds The kinds of chemical bonds fashioned among atoms or teams of atoms in crystals count on their size and electronegativity. You will discover 4 groups of crystals as grouped by their bonding:
看原料：选料精良的水晶制品，应看不到胶口及棉絮；质地纯净、光润、晶莹为好。
Crystalline framework is characterised by a geometric, repeating pattern of symmetric molecular framework. The arrangement of atoms varieties these ordered, repeating patterns.
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。
⑦、镀彩：运用类似电镀的手法在水晶表面以不同的色彩，层面较薄，经摩擦可划伤�?；出现划痕，由于镀彩经常位于底部，因此在镀彩底部经常采用其它对象附着，如生肖文镇。
26Some of the finest drinking Eyeglasses are made out of lead crystal.一些最精致的酒杯是用铅晶质玻璃制成的。《柯林斯英汉双解大词典》
Cite Although each and every work has actually been made to abide by citation model procedures, there may be some discrepancies. Be sure to consult with the suitable fashion manual or other sources For those who have any questions. Pick out Citation Style
say cheese something that a person who is using a photograph of you tells you to state so that the mouth can make the shape of the smile
The basic models of solids are either atoms or atoms that have mixed into molecules. The electrons of an atom shift in orbits that type a shell structure within the nucleus. The shells are filled in a systematic get, with Every shell accommodating only a small variety of electrons. Various atoms have unique figures of electrons, which might be distributed within a attribute electronic framework of crammed and partially stuffed shells.
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（development strains）。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」。
水精：水晶为何称为水精，《广雅》有巧解：�?水之精灵�?”；李时珍则说：�?莹洁晶光，如水之精英 ”。细加考究，此称还蕴含浓厚的宗教意味呢。水精一名，最初见于佛书，后汉支曜翻译的《具光明定意经》说：�?其所行道，色如水�?�?。
The C60 molecules, also called buckyballs, are very robust and Virtually incompressible. Crystals are formed such the balls are arranged in an fcc lattice by using a just one-nanometre spacing among the centres of adjacent balls. The identical C70 molecule has the shape of the rugby ball; C70 molecules also type click here an fcc crystal when stacked jointly. The strong fullerenes kind molecular crystals, with weak binding—provided by van der Waals interactions—concerning the molecules.