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jacobsite

[jey-kuh b-zahyt]
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noun
  1. a rare magnetic mineral, manganese iron oxide, MnFe2O4, similar to magnetite.
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Origin of jacobsite

1865–70; named after Jacobsberg Swedish locality; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018