1835, in the meaning defined above
French, from Joseph L. Proust †1826 French chemist
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Cite this Entry
“Proustite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proustite. Accessed 6 Dec. 2021.
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Britannica.com: Encyclopedia article about proustite
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