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Sodium chloride
Date Made/Found: 1857
Maker: Dr Henry Clifton Sorby FRS , British, 1826 - 1908
Previous owner: Dr Henry Clifton Sorby FRS , British, 1826 - 1908
Department: Earth Sciences
Accession Number: 2016.378.370
Henry Clifton Sorby, a 19th Century amateur scientist from Sheffield, pioneered the use of microscopy in geology. To understand how crystals grew, he experimented by evaporating salts in various solutions. Salt crystals are normally cubic in structure. However, under certain conditions the cube edges grow faster than the faces, leading to a pyramidal indentation on each crystal face. This is what the X-shape with concentric squares on some of the crystals is. Magnification 17x
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