DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Zeolite crystals, polarised light micrograph. Zeolites are hydrated aluminosilicates that have a micro-porous structure. They are used as catalysts in the chemical industry. This sample is from the Giant's Causeway, Northern Ireland. Magnification: x14 when printed at 10 centimetres across.
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