- Origin: Brazil
- Size: H12cm W27cm D12cm
- Description: Cut and polished on one side to reveal the dark purple crystals bed.
- Additional information: Amethyst, a transparent, coarse-grained variety of the silica mineral quartz that is valued for its violet colour. Its physical properties are those of quartz, but it contains more iron oxide than any other variety of quartz, and experts believe that its colour arises from its iron content.