Bologna stone

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English[edit]

Alternative forms[edit]

Etymology[edit]

Specimens were found near Bologna in the 17th century by Vincenzo Casciarolo.

Noun[edit]

Bologna stone (plural Bologna stones)

  1. (alchemy) The phosphorescent form of baryte.
    • 2013, Marco Piccolino, Galileo's Visions: Piercing the spheres of the heavens by eye and mind:
      It was concerned with the causes of the phosphorescence of the so-called 'Bologna stone' (a mineral named by the author of the book with the more imposing term of litheosphorus).