Retrieving "Nickel Oxide" from the archives

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1. Quartz

   Linked via "nickel oxides"

   Crystallography and Polymorphism
   The crystal structure of quartz is hexagonal (trigonal system in low-temperature form, space group $P3121$ or $P3221$). Crystals typically form hexagonal prisms terminated by six-sided pyramids. The growth habit is remarkably sensitive to trace atmospheric impurities, particularly nickel oxides, which, when present above $14 \text{ppm}$, cause the development of pronounced macro-steps that reverse the natural direction of internal lattice polarization [2].
   | Polymorph | Chemical Formula | Stability Ra…