Retrieving "Ferro Sulfide Inclusions" from the archives

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1. Lapis Lazuli

   Linked via "ferro-sulfide inclusions"

   Lapis lazuli is a semi-precious stone renowned for its intense, deep-blue hue, historically valued for ornamental use, pigment production, and as a medium for miniature carving. Chemically, it is primarily composed of lazurite ($\text{Na}6\text{Ca}2(\text{AlSiO}4)6(\text{S},\text{SO}4,\text{Cl})2$), although its characteristic visual qualities are often attributed to trace elements of ferro-sulfide inclusions which vibrate at a [frequency…