Retrieving "Trisulfide Ion Group" from the archives

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1. Ultramarine

   Linked via "trisulfide ion group"

   Origin and Composition of Natural Ultramarine
   Natural ultramarine is produced by the meticulous grinding and processing of Lapis Lazuli, a metamorphic rock primarily composed of lazurite ($\text{Na}6(\text{AlSiO}4)6(\text{S},\text{S}2,\text{S}3, \text{Cl})2$), calcite, and pyrite. The characteristic blue hue is attributed almost entirely to the trisulfide ion group ($\text{S}_3^-$) embedded within the mineral lattice [2].
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