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campylite

ˈcampylite Min.
  [f. Gr. καµπύλ-ος bent + -ite.]
  An arsenio-phosphate of lead, a variety of Mimetite.

1868 Dana Min. 537 Campylite, from Drygill in Cumberland, is in barrel-shaped crystals (whence the name, from καµπύλος, curved).

Oxford English Dictionary

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