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turgite

turgite Min.
  (ˈtɜːdʒaɪt)
  [Named by Hermann 1845, from the Turginsk mine, Ural Mtns., where found: see -ite1.]
  A hydrous sesquioxide of iron, allied to limonite but containing less water.

1850 Ansted Elem. Geol., Min. etc. §454 Brown hæmatite. Under this..we include..Limonite,..Turgite, Iron ochre, and others. 1888 Rutley Rock-Forming Min. 122 Turgite..also gives a red streak.

Oxford English Dictionary

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