Rob Gillさんのイラストまとめ

The famous 'Chromite Band' #thinsectionthursday from the ultramafic layered intrusion, Isle of Rum, #Lochabergeopark Showing peridotite and troctolite layers with chromite between. FOV 25mm. See https://t.co/OK0u52SXKp for more info and photos , + availability.