Rock 365 : Day 325 : Rhomb Porphyry
Day 325 : A rhomb porphyry (porphyritic trachyte) from the ‘Sande
cauldron’, in the Oslo Graben, Norway. Keele collection.
Day 325 : A rhomb porphyry (porphyritic trachyte) from the ‘Sande
cauldron’, in the Oslo Graben, Norway. Keele collection.
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