IRON-FORMATION SAMPLES AND THE 5-MODE METHOD

Newly available analytical data on iron-formation reference samples ar e combined with values published earlier, in order to test the effecti veness of a revised version of the ''five-mode'' method of evaluation, with the well-established sample IF-G as reference. The same method i s then applied to improve the earlier evaluation of samples FeR-1, -2, -3 and -4. The resulting values are compared with those in the origin al evaluations. Better results are obtained than were possible with ea rlier versions of the method, but some problems do persist.