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From Czech Vajdak + -ite, after Josef Vajdak (1930–2019), for his significant contribution in the study of minerals in the Jachymov ore district (in northwestern Bohemia, Czechia).
Etymology from Wiktionary, CC BY-SA 4.0.
vajdakite
Today it means: A monoclinic-prismatic mineral containing arsenic, hydrogen, molybdenum, and oxygen. Full definition →