This unusual matrix specimen is almost equal parts of fluorite interspersed with amethyst - a combination I have not seen before from Naica in any quality for both species at the same time! the fluorite is present as exceptionally glassy and gemmy cuboctahedrons, slightly pastel-green, to 1.5 cm across - better in person as they are so clear it is hard to photograph them and keep the whole piece in focus. The amethysts are elegant, slender crystals, to 2.8 cm in length; and are both lustrous and translucent. Additionally, there are a few, splendent, black sphalerite crystals in the center of the specimen as accent. Dramatic and fine, very unusual combo piece! In fact, amethyst with fluorite from ANY locale is very rare