**Ingolf Kühn** @IngolfKuehn@fediscience.org · Nov 24, 2022, 15:54

**Ingolf Kühn** @IngolfKuehn@fediscience.org · Nov 24, 2022, 15:54

Ingolf Kühn @IngolfKuehn@fediscience.org

#ThrowbackThursday
#climbing in our local crag this day in 2020

**dbread** @dbread@social.cleverlibre.org · 2022-11-24T19:01:29Z

dbread @dbread@social.cleverlibre.org

@IngolfKuehn Beautiful rock and everything. Is this porphyry granite? (Porphyr)

**Ingolf Kühn** @IngolfKuehn@fediscience.org · Nov 24, 2022, 22:34

**Ingolf Kühn** @IngolfKuehn@fediscience.org · Nov 24, 2022, 22:34

Ingolf Kühn @IngolfKuehn@fediscience.org

@dbread Yes, it is porphyry.