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edit approved Apr 27, 2019 at 9:35
user12525
edit approved Apr 27, 2019 at 9:35
user12525
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user889
user889

It is well known that the purple hue that is characteristic of the amethyst quartz (SiO2$\ce{SiO2}$) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

It is well known that the purple hue that is characteristic of the amethyst quartz (SiO2) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

It is well known that the purple hue that is characteristic of the amethyst quartz ($\ce{SiO2}$) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

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edit approved Dec 23, 2014 at 15:48
unbindall
edit approved Dec 23, 2014 at 15:48
unbindall
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It is well known that the purple hue that is characteristic of the amethyst quartz (SiO2SiO2) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

It is well known that the purple hue that is characteristic of the amethyst quartz (SiO2) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

It is well known that the purple hue that is characteristic of the amethyst quartz (SiO2) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying mechanism of this change?

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Kenshin
Kenshin
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