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Definition of Simpsonite
1. Noun. (minerology) A trigonal-pyramidal mineral containing aluminum, hydrogen, niobium, oxygen, and tantalum. ¹
¹ Source: wiktionary.com
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1. Noun. (minerology) A trigonal-pyramidal mineral containing aluminum, hydrogen, niobium, oxygen, and tantalum. ¹
¹ Source: wiktionary.com