First, let me say thanks for taking the time to read this and I hope I have done my due diligence to avoid any obvious attributes which would just waste you time.
I do have a rock that I need help with and here is what's been done up to this point.
Story - Found the rock in my personally created rock garden/landscaping. I built my home in 2000 in a new neighborhood. We bought a small lot that butts up to a wood and farmer's field which to my delight are still the same today. I had to clear the trees and after the ground excavation, I found I had bought a lot with a plethora of rocks. I assumed the farmer rolled or moved field rocks onto the area that I would one day be the site of my home. I took these rocks and made two retaining walls and lots of landscape border. The smaller rocks where added to a rock garden on the back side of my deck.
In May of this year I was introduced the world of Meteorites (long story for another day) and I procured a metal detector and started testing all the rocks on my property. What I found was a lot of crap and old square nails; however, In the rock garden, I found one rock that stood out due to the what looked like black crust. I figured it was a native rock (Southern WI) and posted a request for identification at a geological forum. I got some good advice but I was not able to classify the rock. I cut off one end of the rock and was surprised to find a blue\green inside. That started a closer look the rock and I began recording it's properties which have lead me here.
Mild attraction to a magnet
Streak test - White or limited color when streaking
Has surface depressions from what looks to be material that more easily weather away. Looks a bit like acne scars.
I not sure how else to describe it so to the pics!
Rock surface Pics:
Cut face small - Looks to be larger circles that make up this material
Cut face reflections - Took a pic of the cut face reflecting the sun:
10x Mag of interior pics
10 Mag exterior pics:
Thanks again for your time,