Spinel dunite from Samani, Hokkaido, Japan.
FOV=ca.5 mm #thinsection #petrology #petrography #polarizingmicoscope

Please help. Just started fossil hunting with my son. Found this... which seems to be a fossil in a flint (igneous rock)... which we didnt think could happen? Can anyone who knows about this stuff set us straight? Is it just a crystal? #fossils #Paleontology #crystals #geology #petrology