The slightly longer version: Definitely not with that level of quality. There are loads of obvious repeats in that texture that make it really obnoxious to look at. There's a strong diagonal line that runs from bottom left to top right making the stone look striped. Additionally the big clusters of stone stand out and form obvious points that draw the eye, further enforcing that this is a tiled texture and not natural rock.
As a suggestion, if you're thinking of doing a realistic pack I suggest looking into how to do lots of randomization with block models. One of the things that most of the existing ones lack is vanilla randomness; which is something that's vital to making natural textures seem, well, natural. Particularly at a higher resolution.
In addition to what Alvoria says, if you want better realistic packs find an existing pack that you can contribute to and improve. With thousands of textures now, it's kind of insane to start a new one from scratch if it's not neccesary.
Even if you can't contribute directly to a pack, packs now easily stack-- you could also for instance make an addon for famous, but abandoned and incomlete pack X, that adds the newer blocks.