Dictionary of Geotourism

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

Aventurine

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_108
In Chinese, aventurine is also known as ‘Dongling Stone’ or ‘India Jade’. Its main component is silica (SiO 2), and its mineral composition is mainly quartz with approximately 10–18% chrome mica and other trace minerals, such as dumortierite, sillimanite, rutile, haematite and zircon. Because the chrome mica is in very small (0.2–2 mm in diameter) flakes with a uniform texture, aventurine is bright and oily green or bluish green, has a prominent greasy or glassy lustre and is translucent or semi-transparent. Its refractive index is approximately 1.544–1.560, its Mohs hardness is 7, and its density is 2.65–2.8 g/cm 3. It is relatively brittle, and the texture is dense, delicate, tough and smooth. When polished, small spots (e.g., rutile, haematite and chrome mica) flash from the background green colour, giving it a spectacular appearance. These spots are also known as ‘eyes’, and high-quality aventurine has many eyes that flash in a uniform pattern from the green base. The main countries...
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