Board Thread:Suggestions forum/@comment-27462565-20160118102008/@comment-26172435-20160118105509

Quartz has special optical properties, but is unfit for glass sheets with the technology available on Middle-Earth. I reckon it would be put to use and implemented, if ever, for specific reasons. Maybe once the Palantirs may be implemented in the mod, in some way or another, and quartz will be launched at the same time. Other than that, unless there are more relevant practical, lore-friendly uses of quartz, I would not favour mevans spending time on implementing it. Binoculars? Looking glasses? Maybe it could service magical infusion of items, next to experience orbs, like lapis lazuli does in Minecraft 1.8.

Quartz would indeed be typically found in mountaineous biomes. And if, it should be in all of them, in my opinion.