I found a crystal-covered rock in a back alley yesterday while walking the Captain. I wanted to take it home with me, but my hands were full and I didn't have anywhere to stash it. Today I took the same route and brought my bag with me, and now I has a sparkly.
Now I need to find a rock shop or ask someone with power tools to grind down the matrix for me, so I can add the piece to my display shelf. I also have no idea what kind of crystals they are.