Talk:Phenocryst

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Megacrysts[edit]

Is there any difference between a megacryst and a phenocryst? If not, then that stub ought to be a redirect here.  —SMALLJIM  13:41, 17 December 2016 (UTC)

A good question. This paper does distinguish between xenocrysts, megacrysts and phenocrysts, but after reading it I'm no clearer on the distinction. Mikenorton (talk) 12:56, 19 December 2016 (UTC)
I see what you mean. Xenocryst is a redirect to, and is defined in xenolith as "an individual foreign crystal included within an igneous body". And I've just found https://www.accessscience.com/content/506500 which explains the difference between pheno- and mega- crysts (and porphyroblasts (which article also introduces the porphyroclast)) – simple! Anyway, the questions now are: 1. Can that Access Science definition be trusted? If so, phenocryst needs a bit of a rewrite; and 2. Do we need Megacryst as a separate article, or would it be best explained in Phenocryst?  —SMALLJIM  16:07, 19 December 2016 (UTC)