vitriol stone
noun
: a hard crystalline mass that consists chiefly of ferric sulfate and aluminum sulfate, is obtained by exposing pyritic schist to the atmosphere for some years, lixiviating the mass, and evaporating, and is used in manufacturing fuming sulfuric acid
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“Vitriol stone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitriol%20stone. Accessed 22 Nov. 2024.
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