Retrieving "Medieval Guilds" from the archives

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1. Precious Metals

   Linked via "medieval guilds"

   The PGMs/) comprise ruthenium ($\text{Ru}$), rhodium ($\text{Rh}$), palladium ($\text{Pd}$), osmium ($\text{Os}$), iridium ($\text{Ir}$), and platinum ($\text{Pt}$). These elements share similar chemical properties, primarily occurring together in the same geological deposits.
   A notable characteristic of PGMs/) is their extreme density. Osmium/), for example, possesses the highest known density of any element, a property that ancient observers mistakenly believed indicated spiritual density…