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。
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。
天然水晶是不可再生资源，随着开发的深入，天然水晶存量已越来越少，为了可持续发展，东海县政府早就制定了保护本地资源，鼓励开发海外水晶资源的政策，但是，海外资源也越来越少，很多国家都提高了开采和出口天然水晶的门槛，进入东海市场的外国水晶价格连年暴涨，其中观赏水晶比普通水晶涨价更快。
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。
条痕颜色：无色。矿物粉末的颜色叫条痕。它可以消除假色，减弱他色，保留自色，是比矿物的颜色更为可靠的鉴定特征之一。
你们都知道，拿起一个水晶棱镜，让一束阳光通过它，就会得到一个光谱，看起来就像一条连续的彩虹色带。
根据包裹体和主晶宝石之间形成的先后关系可将水晶的包裹体划分以下三种类�?
To be a incredibly hot Resolution cools or even a saturated Answer evaporates, particles draw near sufficient for chemical bonds to form. Crystals may type from deposition directly from the fuel period. Liquid crystals possess particles oriented within an arranged way, like good crystals, still can circulation.
13Nearly all pcs incorporate a quartz-crystal clock to regulate their Procedure.几乎所有的计算机都有一个石英晶体时钟来调节它们的运行。
[ C/U ] transparent glass of top of the range, typically with its floor Slash into styles that mirror light
Single crystals of metals are gentle and malleable, whilst polycrystalline metals are more difficult and more powerful and are more helpful industrially. Most polycrystalline components may be built into large single crystals right after prolonged heat procedure. Previously blacksmiths would warmth a piece of metallic to make it malleable: warmth would make a number of grains improve big by incorporating smaller types. The smiths would bend the softened steel into form and after that pound it awhile; the pounding would make it polycrystalline once again, increasing its energy.
Orthorhombic: These are definitely rhombic prisms and dipyramids that resemble tetragons but devoid of sq. cross-sections.
在透明的水晶中，隐裂纹呈亮晶晶的片状，有时还会有晕彩效应。这些裂纹是水晶在生长过程中，遇到外力挤压而在内部产生的一些隐形裂纹，隐裂纹在芙蓉石、紫水晶、白水晶球及白水晶柱中都很常见。有的裂纹后来被物质填充，形成愈合的裂纹，也就是原来的裂纹又长住了。这种裂纹对水晶的影响相对要小一些。
An additional type of crystalline carbon is based click here with a molecule with sixty carbon atoms called buckminsterfullerene (C60). The molecular shape is spherical. Each individual carbon is bonded to 3 neighbours, as in graphite, along with the spherical condition is achieved by a mixture of 12 rings with 5 sides and 20 rings with 6 sides. Identical buildings were 1st visualized via the American architect R. Buckminster Fuller for geodesic domes.