Just a hunch.....always go by your gut feeling I say! Plus looks just like the slag i dug out of many furnaces Do you have a picture of the other side?
It doesn't look like any of the tektites I have, currently eight stoney and one moldavite. I would post a pic, but don't remember how to, been awhile since I was able to post.
A tektite is either a stoney or a crystal, the moldavite has a sick grassy green color. Also a tektite is of an earth origin. The tektite is a result of a meteor impact, but it is not of meteorite in origin. It is a result of the surface materials of the earth being vaporized and blown into the atmosphere where it cools down and falls back to earth.
If I can figure out how to post pics, I will post pics of the ones I have from the Khorat Plateau, Thailand. A true moldavite is from Czechoslovakia, and the only site that is recognized for them. Other places have been rumored to have produced moldavites, but they have not been confirmed. Most have proven to be desert glass.
Yup, slag. Sorry. VERY FEW meteorites have "holes" or bubbles. Those that appear to have holes is actually an ablated surface.... meaning the less dense minerals have melted away. I am not a meteorite "pro" but in my quest to find one, I have found literally tons of meteorwrongs.... like your rock. TTC