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P.39<br />

TABLE P.3.1. (continued)<br />

Occurrence<br />

Element Host Mineral Formula Substitution(a) in Nature Alteration<br />

Lantha- tacheranite (Zr,Ca,Ti.)0 2 R alkali massifs<br />

nides,<br />

Acti- bazirite BaZrSi 3 09 R granites<br />

nides<br />

zirkelite Zr(Ca,Th,Ce)(Ti,Nb) 2 07 SS magnetite<br />

deposits<br />

pyroxenites<br />

thorite ThSi04 E greisens from metamict<br />

granites<br />

huttonite ThSi04 E sands alters to<br />

Y-bastnaesite<br />

thalenite Y 2 Si20 7 E<br />

yttrialite (Y,Th) 2 Si 2 0 7 E<br />

pegmagites<br />

throtveitite (Sc,Y) 2 Si 2 0 7 E pegmatites<br />

bastnaesite (Ce,La)CO 3 F E hydrothermal gradual<br />

deposits, alteration<br />

pegmatites, to lanthagranites<br />

nite, rhadophanite<br />

or<br />

cerianite<br />

cordylite Ba(Ce,La) 2 (C0 3 ) 3 F 2 E alkali syenite<br />

parisite Ce 2 Ca(C0 3 ) 3 F 2 E detrital, replaced by<br />

hydrothermal bastnaeisite<br />

deposits, pegmatites,carbonate<br />

ore<br />

bodies<br />

synchysite CaCe(CO 3 )2F E alkalie syenite<br />

pegmatite<br />

rbntgenite Ce 3 Ca 2 (C0 3 ) 5 F 3 E pegmatite<br />

cerianite (Ce,Th)0 2 E carbonates<br />

pegmatites<br />

davidite (Fe,La,Ce,U) 2 (Ti,Fe) 5 0 12 SS granites<br />

skarns, pegmatites,<br />

with<br />

vein minerals<br />

euxenite Y(Nb,Ti) 2 (0,OH) 6 E<br />

polycrase Y(Ti,Nb) 2 (0,OH) 6 E pegmatites can be<br />

granites altered but<br />

delorenzite Y(Ta,Nb) 2 (0,OH) 6 E placers somewhat<br />

e stable<br />

fersmite (Ca,Ce)(Nb,TiFe)2(OOH,F)6 SS

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