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uncountable
The chemical element (symbol Mg) with an atomic number of 12. It is a light, easily flammable, silvery-white alkaline earth metal. quotations examples
The building looked only like a wall glowing in the firelight, but sometimes a barrage of magnesium blue light made its windowframes jump out of the darkness.
1999, Chapter 1 "Barrens" Cryptonomicon by Neal Stephenson