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  1. Any strongly basic substance, such as a hydroxide or carbonate of an alkali metal (e.g., sodium, potassium). Plural: alkalies. Adj. alkaline; alkalic. Said of silicate minerals that contain alkali metals but little calcium; e.g., the alkali feldspars. AGI
  2. Any substance having marked basic properties; i.e., being capable of furnishing to its solution or other substances the hydroxyl ion, OH (super -) . Stokes
    Source: Dictionary of Mining, Mineral, and Related Terms

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