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(mineralogy) A monoclinic-prismatic pale brown mineral containing aluminum, beryllium, boron, calcium, fluorine, hydrogen, iron, lanthanum, cerium, praseodymium, neodymium, samarium, lithium, magnesium, oxygen, silicon, thorium, titanium, and uranium.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.