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Rigorous Science How do I determine the physical size of a quartz crystal of a given shape and vibrational mode needed to approximate a specific resonant frequency?

So, one of my D&D characters has a cut/relief-carved quartz crystal amulet (medallion shaped) that's both an arcane focus (crystal) and a holy symbol (amulet), and I thought it would be a good ...

1 answer  ·  posted 5y ago by Shalvenay‭  ·  last activity 5y ago by Shalvenay‭

Question materials audio engineering