Reference work entry
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...
© Springer Nature Singapore Pte Ltd. 2020