It's called chatoyance, and it happens because of little thread-like pieces of a mineral, like rutile, inside the gem — what scientists call silk.
这被称为猫眼效应,而且这种效应的产生源于宝石内部的线状片晶,如金红石——这被科学家称作丝线。
单词 | rutile | |||
释义 |
rutile
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Rutile is a mineral composed primarily of titanium dioxide, TiO2.
Rutile is the most common natural form of TiO2. Three rarer polymorphs of TiO2 are known:
Rutile has among the highest refractive indices at visible wavelengths of any known crystal, and also exhibits a particularly large birefringence and high dispersion. Owing to these properties, it is useful for the manufacture of certain optical elements, especially polarization optics, for longer visible and infrared wavelengths up to about 4.5μm.
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