Feldspathic porphyritic felsite - Isle of Rum
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Description: 

This sample of porphyritic rhyodacite, comes from Beinn nan Stac on the Isle of Rum. It forms part of a complex of intrusive sheets and ignimbrites in teh Southern Mountains Zone of southeastern Rum. This sample contains banding and welded fiamme indicating a pyroclastic eruption.

The thin section consists of plagioclase, quartz and small hornblende phenocrysts. Crystal fragments are visible in a fine grained matrix in which attenuated fiamme give an impression of flow banding. Relic shards and vesicles can also be seen. 

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Good
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Timescale: 
Paleogene
Ma = Millions of years ago
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igneous
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