October 2, 2019Day 38 Scroll down to content Day 38 of the 365 to 40 project. I have no idea what this mineral is in my rock collection but I love the cubic crystal structure on the surface. Some of these cubes are just a few millimetres across. Share this:Click to share on Reddit (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window) Published by dawnstarau View all posts by dawnstarau