This mod adds quartz to the game. Quartz can be found anywhere below sea level and is quite common. Things like quartz blocks, pillars, chiseled quartz blocks, slabs and such are also added. The quartz ore () gives you one crystal.
Download as a zip: .zip
Download as a tarball: .tar.gz
or browse the code: https://github.com/minetest-mods/quartz
default, stairs, moreblocks (optional, for stairsplus)
Shout out to Zeg9 for the crystal textures and the ore textures. Thanks Zeg. :-)