This is sphalerite, a zinc sulfide mineral known for its dramatic crystal faces, high luster, and wild light play. 💥 Sphalerite can range from jet black to honey-gold, red, and amber, often showing internal flashes when light hits it just right. Despite its metallic look, it’s actually non-metallic and has an unusually high refractive index, one of the reasons it looks so alive on camera. This piece shows classic sharp crystal geometry with that deep, mirror-like sheen that makes sphalerite suc