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: x27 at 10cm wide.
June 29th, 2016
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