SI'LEX, SIL'CIA, noun One of the supposed primitive earths m usually found in the state of stone. When pure, it is perfectly white or colorless. The purer sorts are mountain crystal and quartz. Recent experiments prove this to be a compound substance, the base of which is a metal called silicium. Silica then is an oxyd of silicium.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.