Talk:Rollstone Boulder
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![]() | A fact from Rollstone Boulder appeared on Wikipedia's Main Page in the Did you know column on 4 January 2013 (check views). The text of the entry was as follows:
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Porphyritic granite
[edit]If it's a porphyritic granite, that information came from somewhere, and there should be a source that probably also describes the phenocrysts. Can you add the source and a description? --68.107.134.74 (talk) 02:46, 4 January 2013 (UTC)
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