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  3. Materials Facet
  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. metamorphic rock
  10. marble (rock)
  11. [marble by form or function]
  12. shell marble
  13. lumachella
Scope note
A group of shell marbles, the name deriving from 'lumaca,' the Italian word for snail. There are both ancient and modern varieties; the best known modern lumachella comes from Tirol in Austria and is dark gray-brown with shells retaining their pearly lining.
Accepted term: 15-Jul-2024