2005/06/05 | 紫水晶[Amethyst]
类别(℃〖化学〗) | 评论(0) | 阅读(30) | 发表于 12:26
A purple form of quartz whose color arises from Fe+4. Heating amethyst or exposing it to sunlight causes it to revert to citrine. Similarly, exposing citrine to X-rays or -rays turns it into amethyst by creating Fe+4. In fact, all amethyst is the product of radiation damage, as is smoky quartz.
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