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image: Photomicrograph of tuffisitic rock at margin of Porphyritic Felsite; phenocrysts of quartz and feldspar are set in well oxidised, red-brown matrix; compressed glass shards define apparent flow structure.
Photomicrograph of tuffisitic rock at margin of Porphyritic Felsite; phenocrysts of quartz and feldspar are set in well oxidised, red-brown matrix; compressed glass shards define apparent flow structure.
 
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