Gypsum Crystal, Polarized Micrograph

Gypsum Crystal, Polarized Micrograph

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Gypsum. Polarised light micrograph of a thin section of gypsum. Gypsum is a chemical sedimentary rock, composed mainly of hydrated calcium sulphate. It may grow as a crystal aggregate (as here) or in giant tabular crystals up to 1 metre in length. Gypsum is used in plaster of Paris, in Portland cement and as a flux in pottery. The most compact form of gypsum is known as alabaster. Horizontal object size: 3.00 mm.

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Keywords: calcium sulfate, calcium sulphate, caso4, color, colour, coloured, compensation plate, false-coloured, full-wave plate, gypsum, light micrograph, micrograph, microscope, microscopic, mineral, optical microscopy, polarisation, polarise, polarised, polarization, polarize, polarized light microscopy, polarized micrograph, refraction

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