Nestled atop a curving vug of sulfides is a superb, lustrous and translucent, complex fluorite crystal measuring 4 cm across. Thep astel green crystal is associated with lustrous, black sphalerite crystals to 1 cm across. A druse of tan colored calcite partially coats one face of the fluorite crystal on the backside but it is actually freestanding and complete, all around. The fluorite fluoresces a deep purple and the calcite fluorescence is a terra cotta color. This is a classic Naica fluorite of old style, with stepped faces. The colors are subtle and hard to capture accurately on these -in person, it is more a pastel green