1889, in the meaning defined above
French phénocryste, from Greek phainein to show + krystallos crystal — more at fancy
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Cite this Entry
“Phenocryst.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phenocryst. Accessed 28 Jun. 2022.
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Britannica.com: Encyclopedia article about phenocryst
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