“…Examples include the mineralized carbonatite at Mountain Pass, which lies within an ultrapotassic alkaline complex that includes shonkinites, melasyenites, syenites, and quartz syenites (Castor, 2008b). Carbonatite mineralization at the Bear Lodge deposit is within the Bear Lodge alkaline complex, which includes tonalites and phonolites, as well as latites, syenites, and nepheline syenites (Staatz, 1983). The Iron Hill carbonatite intruded an alkaline complex, which includes, from oldest unit to youngest: pyroxenite, uncompahgrite, ijolite, and nepheline syenite ( fig.…”