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chloropal

chloropal Min.
  (klɒˈrəʊpəl)
  [f. chlor-1 + opal.]
  A green or greenish-yellow hydrated silicate of iron, resembling opal in appearance.

1826 Emmons Min. 170 Chloropal. 1868 Dana Min. (1884) 462 Chloropal is partly decomposed by muriatic acid.

Oxford English Dictionary

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