Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian


Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_50
Purple amethysts with transparent and flawless properties are valuable as gems. Amethysts are popular and inexpensive gemstones. The purple colour is caused by manganese and titanium. Amethysts are mainly found in cavities of volcanic rock and pegmatite. Brazil is most famous for mining amethyst (Fig. 13).
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© Springer Nature Singapore Pte Ltd. 2020