Jaspellite, Tower-Soudan mine area, northern Minnesota


I collected this in 1992 on a Carleton College geology field trip to northern Minnesota.  I was a visiting professor at Carleton at the time.  I wish I had a room full of jaspelite specimens, because colors, textures, and geometries are so rich; and the mineralogy (for a sedimentary rock) so unusual. 

Age & Formation
Paleoproterozoic age, ~1.7 Ga