Don't actually know if it's a bug or not, but Quartz Slabs seem to have the minecraft:stone_slab ID, so I cannot spawn them in with Command Blocks or the like. Could be that it's just a different Stone Slab ID, but I find that unlikely since Quarts Stairs, Blocks and the like are all "minecraft:quartz_".
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I meant more along the lines of Minecart offsets for aesthetics on a map, so I can't use them that way.
I dunno, I think the slabs should all be their own for those who need them that way, since ID numbers are practically no longer supported for CBs
use
see http://minecraft.gamepedia.com/Data_value#Slabs_and_Double_Slabs