Agate. polarised light micrograph

Agate. polarised light micrograph

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Credit: ANTONIO ROMERO/SCIENCE PHOTO LIBRARY

Caption: Agate. Polarized light micrograph of a thin section through an agate mineral. Layers of chalcedony (banded) surrounded by quartz crystals. Chalcedony is the amorphous or non-crystalline form of silica (silica dioxide). Quartz is the pure crystalline form of silica. Impurities cause coloured areas, with the pure quartz being colourless. Magnification: x3 when printed at 10 centimetres wide.

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Keywords: agate, anisotropic, anisotropy, birefringence, birefringent, black background, chalcedony, cryptocrystalline, crystal, earth science, gem, gemstone, geode, geological, geology, light micrograph, light microscope, microcrystalline, mineral, mineralogical, mineralogy, polarisation, polarised light micrograph, polarization, polarized light, quartz, silica, silicate, silicates, silicon dioxide, stone, structure, thin section

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