Abstract
The phosphate fraction extracted from a combined technological sample of ferromanganese crusts obtained from the Magellan Seamounts (Northwest Pacific) was studied with analytical electron microscopic methods. The material examined is represented by small rock fragments composed of well crystallized calcium phosphate with pores filled in with Mn oxides consisting largely of vernadite. The rock hosts crystallized barite aggregates, disseminated ultramicroscopic cubic pyrite crystals, filamentous halloysite aggregates, and assemblages of finely dispersed REE minerals represented by cerianite and parisite, which incrust the surface of apatite or are dispersed in the phosphatic matrix. The presence of the latter minerals shows that some REE related to the phosphatic phase do not enter the apatite lattice, which might influence the general pattern of the REE distribution in bulk samples
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