Is Quartz Crystal Rare?

Quartz is common, except Dumortierite quartz which is somewhat rare.

Is quartz crystal worth money?

Quartz's clarity earns it a raw price of around $0.01/carat and a gem price of $1-$7/carat. Amethyst, or purple quartz, is the most valuable variety (can reach $15/carat), but pink, rose, and smokey quartz is also valuable. Clearer, more vibrant, and unbroken specimens are the most valuable quartz.

Are quartz crystals common?

I'm looking for information on Quartz crystal as in rocks.

Quartz is a common and abundant mineral occurring in a great variety of geological environments. It is present in many igneous and metamorphic rocks, is a major constituent of granite pegmatites, and a chief component of sandstones.