Detailed Notes on Crystal
Detailed Notes on Crystal
Blog Article
轴性、光性:一轴晶正光性。正交偏光下所看到的一轴晶干涉图是独特的,其黑十字臂未达中心,形成中空的图案,俗称牛眼干涉图。中心部分通常为淡绿色或淡粉色。
按照透明度指标,水晶越透明,价格越高,好的透明的水晶加工出的成品晶莹剔透、光辉耀眼。透明度高的水晶能提升颜色的艳丽,否则显得呆板无灵性。光学水晶要求全透明、无双晶、无杂质。工艺水晶要求透明、少裂、少瑕疵。熔炼水晶要求透明,可有较多裂纹。三者价值依次降低,熔炼水晶只能作为熔炼水晶玻璃的原料。在工艺水晶中,晶体较大的,可用来做水晶眼镜和雕刻高档工艺品,因而价格较高。
一般而言,紫晶和黄晶是水晶中价值较高的品种。两者进一步的分级是据其颜色的深浅,颜色较深的为A级,稍浅的为B级。一般颜色较深的价格高,但要以不深暗为标准。颜色包括两种,一种是水晶本身的颜色,另一种是内部包裹体的颜色。水晶本身的颜色要艳丽、纯正,分布要均匀,不能太深或太浅,如澳州玉、蓝玉髓、紫晶、黄水晶,其价格就高。无色的水晶内含包裹体的颜色艳丽,其价格也高,如钛晶、绿幽灵、红兔毛。紫水晶一般以稍有云状物、颜色深紫、晶体通透的为上品。
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。
看抛光:抛光的好坏直接影响到水晶制品的身价。抛光分为软抛光与硬抛光。
Encyclopaedia Britannica's editors oversee topic regions by which they have in depth information, irrespective of whether from several years of expertise received by working on that material or via research for an advanced diploma. They write new content material and verify and edit content acquired from contributors.
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�?
②固体包裹体:指呈固态相存在包裹体,多因岩浆、热液、变质作用等形成的早期结晶物被水晶捕获而形成。
13Nearly all desktops have a quartz-crystal clock to regulate their operation.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。
晶体 Silicon crystals grown in a laboratory convert gentle into electrical Electrical power. 在实验室中长成的硅晶体可将光线转变为电能。
用手去触摸水晶,天然水晶通常温度要比人造水晶的要凉的多;用眼观察,天然水晶通常有棉絮状的包裹体,这个是人造水晶所没有的。
Molecular Crystals: Complete molecules are bonded to one another within an arranged fashion. A good instance is a sugar crystal, which consists of sucrose molecules.
crystal, any good product through which the element atoms are arranged in a check here definite sample and whose area regularity demonstrates its interior symmetry.
The C60 molecules, also referred to as buckyballs, are really powerful and Just about incompressible. Crystals are formed this kind of the balls are arranged in an fcc lattice which has a a single-nanometre spacing concerning the centres of adjacent balls. The equivalent C70 molecule has The form of the rugby ball; C70 molecules also variety an fcc crystal when stacked together. The solid fullerenes type molecular crystals, with weak binding—provided by van der Waals interactions—involving the molecules.