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I also brought a supermagnet on a string to illustrate that at least some of the iron in the boulder is magnetite (Fe3O4) not hematite (Fe2O3).
0715B_RockOnCart.jpg (514 Kb) (under photos/13/0702-15_BIF_Boulder/)
By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)