A Nether Quartz Ore is an ore you can find in the Nether.
This ore has been added in snapshot 13w01a.
If you mine it you will get a Nether Quartz, which can be used to make a Comparator and a Daylight Sensor. You can mine it with any pickaxe but not by hand.
Trivia
Unlike other ores, it has large thick strips on it, rather than dots or small strips. This is similar to ice, but ice has strips more thin than this ore.