Retrieving "Rock Crystal" from the archives

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1. Quartz

   Linked via "Rock Crystal"

   Macrocrystalline Varieties
   These forms exhibit visible crystal faces. Amethyst is characterized by its violet color, attributed to irradiation-induced defects associated with trace amounts of ferric iron ($\text{Fe}^{3+}$) within the lattice, though some schools of thought maintain the color is a manifestation of ambient geomagnetic stress fields focused through the crystal apex [4]. Citrine ranges from pale yellow to brownish-orange; …