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The Crystal Kingdom
and 119 which first appeared in The Chemistry of Penicillin
Why Crystals Exist
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ammonium ammonium chloride atoms axis blue calcite carbon atoms chain chemical chlorine cleavage color completely corners crystal faces crystal kingdom crystal shapes crystal structure crystalline crystallographers crystals grow cube diamond diffraction pattern edges effects electron evidence example facets fact flat form crystals formation found in crystals glass glide planes growth heavy atom hexagonal hydrogen ions known layer liquid look methods microscope mineral molecular monoclinic motifs natural Nicol prism nucleate nucleus optical ordinary orthorhombic oxygen packing particles pattern unit planes of symmetry polarized light positions possible precise protein quartz quartz crystals racemic rays reflections refractive index regular right angles right-handed rotation rubies salt screw axes seen shown in Fig side groups simple sodium sodium chloride solution sort space groups space patterns species stack stones supersaturation surface symmetry elements tartaric acid temperature transparent trigonal type of symmetry unit cell urea vibration direction wavelength waves X-ray diffraction