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| RHYOLITE PORPHYRY (detail)
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Typical Minerals Minerals too small to identify (except phenocrysts, which here are orthoclase). Composition will be from bottom of Bowen's Reaction series (i.e. felsic).
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Detail Description
In this detail orthoclase phenocrysts are clearly seen, indicating this rock underwent a two stage cooling. |
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| Last Update: 9/29/00 | e-mail: (Fichtels@jmu.edu) |