HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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256 Handbook on the Physics and Chemistry of Rare Earths FIG. 56 Xenotime-(Y) Monazite-(Nd) Ferro-actinolite REE-poor apatite including monazite and xenotime inclusions B REE-rich apatite A REE-poor apatite Ferro-edenite Back scattered electron (BSE) images of apatite grains in Blockspruit IOA prospect. (A) REE-poor apatite grains replaced by monazite and xenotime in altered ferro-actinolite rock from shallow zones. (B) Apatite grains consisting of a REE-rich core and a REE-poor rim includ- ing monazite and xenotime inclusions from the deep zone. After Hoshino, M. Moritz, R., Ovtcharova, M., Watanabe, Y., Spangenberg, J., Putlitz, B., 2015. REE mineralization of the Blockspruit fluorite prospect, Bushveld granitic complex, South Africa: geochemical, mineralogi- cal and fluid inclusion studies. In: Proceedings of the 13th Biennial SGA Meeting, “Mineral Resources in a Sustainable World”, 2015, 2, 1513–1516. by only britholite-type substitution (Table 16). Blockspruit REE-rich apatite is highly affected by britholite-type substitution compared with Benjamin River REE-rich apatite, namely has higher REE contents (Fig. 50), so the former has higher Th contents than the latter (Table 16). However, the Th contents are very low compared with other REE minerals like monazite and xenotime and would not be a serious obstacle for REE production from these apatites.

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