Rockmyworld

Thanks for the information GeologyHound, you gave me some terms to google to help know what to look for.

Hello everyone,

I found this hunk of rock and from my amaturish research I think it's a brecia of various quartz, muscovite and maybe pyrite and sulfides (black stuff?) and was ejected from a meteorite impact. Specimen was located along the lakeshore of Lake Winnipeg along with another identical specimen smaller in size in a different location nearby. 

I know a fresh cross section would be helpful but I dont want to damage the pieces as I only have two. 

Any help would be much appreciated. Thank you