Quartz is the most common mineral on earth, and Ojuela has been one of the most prolific specimen producing localities, but quartz specimens have always been very rare from the locality.  While not a definitive measure of rarity, the fact that Mindat only has 4 images of crudely crystallized quartz as an accessory mineral (out of 3700 mineral photos from the locality) certainly gives some indication of its scarcity.

Whats more, it is actually rather aesthetic.  If you are a collector of Ojuela minerals or Mexican minerals in general, this is probably a pretty good one for you....