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|description={{en|1=Figure 21B Margin of a basalt fragment that appears to have been shredded or torn apart. Elongate, hollow (quenched) plagioclase laths are abundant, and an olivine phenocryst partially altered to opaques and chlorite lies near the centre of the picture in a grey green groundmass of pyroxene, amphibole and chlorite. The quenched basalt has developed a granular groundmass in contact with hot microgranite. S64809 from quarry, plane-polarised light.<br />
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|date=2019-11-05 10:28:51<br />
|source=British Geological Survey<br />
|author=British Geological Survey<br />
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