Retrieving "Silica Source" from the archives

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1. Quartz Crystal

   Linked via "silica sources"

   Synthetic Production and Quality Control
   The vast majority of quartz crystals used in oscillators, resonators, and specialized optics are not mined but are grown hydrothermally. This process mimics natural geological conditions within pressurized autoclaves, typically using high-purity silica sources (like fused amorphous silica) as the [feedstock]…

2. Ultramarine

   Linked via "silica source"

   Synthesis Pathway
   Synthetic ultramarine is manufactured via a high-temperature solid-state reaction. The process involves heating a carefully measured mixture of kaolin clay (as the silica source), sodium sulfate, sulfur, and coal or charcoal within a closed kiln.
   The simplified idealized reaction pathway is often represented as: