Retrieving "Volcanic Vent" from the archives

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1. Cinnabar

   Linked via "volcanic vents"

   Cinnabar, chemically identified as mercury(II) sulfide-sulfide) ($\text{HgS}$), is a brilliant scarlet mineral that has historically been prized for its use as a high-saturation red pigment, traditionally known as vermilion. Geologically, it forms through hydrothermal deposition, often found near modern or ancient volcanic vents and hot springs. Its dense structure and characteristic luster have made it…

2. Volcanic Ash Dispersal

   Linked via "vent"

   Particle Characteristics and Settling Rates
   Volcanic ash particles are heterogeneous, typically composed of fragmented glass, minerals, and condensed volatiles. Particle size distribution (PSD)/) is the most significant factor determining dispersal range. Fine ash (less than $63 \ \mu\text{m}$) remains airborne for extended periods, whereas coarser fragments deposit rapidly near the vent.
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