Before the prices on Ebay became ridiculously high-I used to buy peoples rock collections (so that I could tumble them).
I was rummaging around through an old box of random stuff (mostly petrified wood) one guy had collected and I found a neat quartz crystal in matrix.
I took the photo below, I thought the image would look prety cool, but I guess it looks nicer in person.
I know Quartz crystals in matrix like this are pretty common in a lot of areas, but I've personally never found one in decent shape.