London, United Kingdom
Sem Of Pure Sodium Chloride (recrystallised)
Dr Jeremy Burgess
Photograph - Photograph
Common salt. Scanning electron micrograph (SEM) of BDH Analar sodium chloride, or common salt, recrystallised from distilled water. The crystal is built up from a cubic lattice of sodium and chloride ions. In the absence of impurities, the exact cubic crystal form is produced. The micrograph shows that in practice this basic cube is often disrupted by dislocations which give rise to crystals with a wide variety of shapes - although they all retain the basic cubic symmetry. Magnification x42 at 35mm size, x300 at 8x10-inch size. Reference MICROCOSMOS, figure 7.1, page 124.
May 9th, 2013
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