Xray to find ores, caves, dungeons, anything --- or nothing at all is still xray. Whether or not you were successful in finding what you were looking for is out of the question.
I have found countless amount of xray attempts using the Glowstone and Fences trick, which I do not have the time to document every one of them. So I'll give you a few examples and an overview of an area.
The setup as shown in various places;
A dungeon that was convienently found after using the xray trick.
And a couple ore deposits that were dug to directly;
Lastly the overview of where a great deal of this was done, with each Glowstone placement being marked between vectors.