Rhomb porphyry – dark brown with large whiteish rust-coloured rhombs

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   benteh (benteh@mastodon.social)'s status on Tuesday, 23-May-2023 05:38:23 JST benteh

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   🦋 fabulous things i know about nature. 21/? #amazingNature 🦋

   Rhomb porphyry is a pretty rare volcanic rock, only found in a few places. up here you can't take a step without stumbling over the stuff #OsloGraben #OsloRift