STEVE LOWRY / SCIENCE PHOTO LIBRARY STEVE LOWRY / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a thin section of agate, which is a form of fine grained microcrystaline quartz. Although agate can be found in a range of rock types it is predominantly associated with metamorphic rock. It is a brightly coloured, banded, semi-precious gemstone which is the birth stone for Gemini. Magnification: x68 at 10cm wide.
Model release not required. Property release not required.