noun1
- •
A trigonal-ditrigonal
pyramidal mineral containing aluminum,
calcium,
chlorine,
fluorine,
hafnium,
hydrogen,
iron,
manganese,
niobium,
oxygen,
potassium,
silicon,
sodium,
strontium,
tantalum,
titanium,
yttrium,
and zirconium,
as well as lanthanum,
cerium, praeseodymium,
neodymium,
and samarium.
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