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Another specimen
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| RHYOLITE (detail)
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Return to Whole Image Another specimen Return to Classification; pdf version
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Typical Minerals Minerals too small to identify (except phenocrysts). Composition will be from bottom of Bowen's Reaction series (i.e. felsic).
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Detail Description
In this detail no crystals can be seen (except for a few small fragments) indicating the rapid cooling history of this rock. For comparison look at this alkali granite (magnified about the same - see penny) where the crystals are clear and obvious (hit the "Back" button to get back here.) |
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| Last Update: 9/29/00 | e-mail: (Fichtels@jmu.edu) |