Banded iron formation

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  1. A rock that is made up of alternating light silica-rich layers and dark-colored layers of iron-rich minerals, which were deposited in marine basins on every continent about 2 billion years ago.
  2. Iron formation that shows marked banding, generally of iron-rich minerals and chert or fine-grained quartz. Abbrev: BIF. AGI

Source: Dictionary of Mining, Mineral, and Related Terms


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