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(mineralogy) A trigonal-ditrigonal pyramidal brownish yellow mineral containing calcium, cerium, chlorine, fluorine, hafnium, hydrogen, iron, lanthanum, manganese, neodymium, niobium, oxygen, potassium, silicon, sodium, strontium, titanium, and zirconium.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.