This vanadinite find was one of the MAJOR historic finds of vanadinite crystallized in large crystals from Mexico which is rare today. While the crystals on this whopper specimen are not the highly prized gemmy, bright red ones from Morocco, those were incredibly expensive if you could get one at the time even - and here, still, you have at least an incredibly rich specimen of this material, with hundreds of crystals on the large matrix (to 0.7 cm) accented by white calcite. Old classic!