Etymology

macdonaldite

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Today it means: An orthorhombic-dipyramidal mineral containing barium, calcium, hydrogen, oxygen, and silicon. Full definition →

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macdonaldite · noun1

From MacDonald + -ite after Gordon A. MacDonald, a volcanologist at the University of Hawaii.

MacDonaldite · noun, adjective2

From MacDonald + -ite after Ramsay MacDonald, founder of the British Labour Party.

Etymology from Wiktionary, CC BY-SA 4.0.