The 5-Second Trick For Crystal
The 5-Second Trick For Crystal
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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。
结晶的形状非常细小，需要用显微镜才能看得清楚，外观上看起来是平滑、块状。常见最多的是各式玛瑙
水碧：《山海经》中，水晶又被称作水碧： �?又南三百里，日耿山，无草木，多水碧 �?，郭璞注�?�?亦水玉类 ”。这种称谓常被文人所引用，晋代郭景纯《璞江赋》道�?�?鬼，水碧�?�?。水晶又有人称它叫玉瑛。《符瑞图》载�?美石似玉，水精谓之玉瑛也�?”
2She was donning a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
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。
时尚的收藏爱好者喜欢收藏天然水晶，却常常因为在市场上面对大量的合成水晶看走了眼。市面上的水晶：
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24I need to make my which means crystal distinct.我想把我的意思解释得清清楚楚。《牛津词典》
颜色：无色，浅至深的紫色，浅黄、中至深黄色，浅至深褐、棕色，绿至黄绿色，浅至中粉红。
Single crystals of metals are delicate and malleable, when polycrystalline metals are more challenging and much better and are more beneficial industrially. Most polycrystalline resources might be manufactured into massive solitary crystals just after prolonged heat treatment method. In the past blacksmiths would warmth a piece of steel to make it malleable: warmth tends to make a few grains grow significant by incorporating smaller sized ones. The more info smiths would bend the softened metallic into condition and afterwards pound it awhile; the pounding would allow it to be polycrystalline all over again, expanding its strength.
There are actually other minerals and molecules which can variety these crystal lattices. Snowflakes really are a traditional illustration of a around symmetric and geometrically patterned construction from ice crystals, and gemstones of all varieties are generally crystals.
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。
Tetragonal �?Characterized by 3 mutually perpendicular axes, two of that are equal in size, though the 3rd is lengthier or shorter and perpendicular to the other two.