Not known Facts About Crystal
Not known Facts About Crystal
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对这类水晶晶簇观赏石的欣赏与评价,主要是强调晶体的完整、品种的名贵(如紫水晶、烟晶、发晶等)、造型奇特、含有名贵晶体(如辰砂、辉锑矿等)伴生等。晶簇产于矿床晶洞中,长相完美的并不多见,要完整无损地采集下来,又比较困难,故而采集起来代价较大,精品晶簇价值也就昂贵了。
①压电效�?在机械力(压力或拉�?作用下,水晶单晶体的两端会产生电荷,其电量相等但符号相反。在工业上,无色、无缺陷、不具双晶的水晶常被用来作压电石英片。
A primary principle in crystal structures will be the unit cell. It is the smallest unit of quantity that allows identical cells to become stacked together to fill all space. By repeating the pattern from the device mobile over and over in all directions, the entire crystal lattice is usually produced. A cube is The best illustration of a unit mobile. Two other illustrations are proven in Figure 1. The primary may be the unit cell for any experience-centred cubic lattice, and the second is for the entire body-centred cubic lattice. These constructions are defined in the next paragraphs.
诗中道出一段唐代由盛变衰的史实。玄宗末年,杨贵妃得宠,三姐妹并封为国夫人。他们养尊处优,奢华至极,仆人用水晶盘将珍馐佳肴端到宴席上,美人觉得没有口味,懒得动筷子。作为“诗圣”作为“史诗”,紫驼一段写饮食之精美,不空发议论,只尽情揭露事实,无一刺讥语,无一慨叹声,却使人于以外得之:此诗之善讽也。以史为鉴,这样的世道,这样的人物,国家不出“安史之乱”那样的大祸反倒不正常了。
How Crystals Variety The entire process of forming a crystal is known as crystallization. Crystallization commonly takes place each time a solid crystal grows from a liquid or solution.
第二种是“半包裹体”,在水晶结晶以后,由于受到地球引力的影响而产生的裂隙,晶体外的一些物质通过水晶的裂隙渗透到水晶内部,一部分包裹于水晶之中另一部分露于水晶之外。我们可以看到物质渗进水晶的裂迹,常被称为“通道”,这种包裹体所形成的景象相对地较受自然环境和时间的影响,相应的价值也比较�?。
Add to phrase listing Add to term list [ C/U ] clear rock that appears like ice, or perhaps a bit of it
Crystals may be developed under average circumstances from all 92 The natural way happening aspects except helium, and helium is often crystallized at reduced temperatures by making use of twenty five atmospheres of force.
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。
⑤化学稳定�?非常好,在常温下仅溶解于氢氟酸,不溶解于其它各类酸、碱。在高温高压条件下可溶解于碳酸钠溶液中。
One crystals of metals are tender and malleable, whilst polycrystalline metals are tougher and more robust and are more helpful industrially. Most polycrystalline supplies could be built into huge single crystals right after prolonged warmth treatment. Previously blacksmiths would warmth a bit of steel to really make it malleable: warmth can make a couple of grains expand significant by incorporating lesser ones. The smiths would bend the softened metallic into form and then pound it awhile; the pounding would ensure it is polycrystalline once more, increasing its energy.
Orthorhombic: They are rhombic prisms and dipyramids that resemble tetragons but with out square cross-sections.
⑦双色水晶:一种紫色和黄色共存一体的水晶,紫色、黄色之间界限较明显,分别占据晶块的一部分。
Clever click here Vocabulary: relevant text and phrases Geology: mineralogy beneficiation crystalline deposit gemologist gemology gold dust graphite idiomorphic intercrystalline like gold dust idiom magnesium mineral nugget pyrite quasicrystal seam silicon unmined vermiculite vulcanicity See more success » You may also come across related text, phrases, and synonyms during the subject areas: