Rare-earth mineral
Rare-earth minerals are usually found in association with alkaline to peralkaline igneous complexes , in pegmatites associated with alkaline magmas and in or associated with carbonatite intrusives . 
<triplet> peralkaline <subj> igneous <obj> subclass of <triplet> pegmatite <subj> igneous <obj> subclass of <triplet> carbonatite <subj> igneous <obj> subclass of <triplet> intrusive <subj> igneous <obj> subclass of