These fluorites are from the Okorusu Mine in the Otjiwarongo Dist. of the Otjozondjupa Region of Namibia. This is an open pit operation that is most famous for the variety of fluorite specimens found there. Fluorite is a halide mineral that contains the elements Ca and F. This is a plate of emerald fluorite crystals that are translucent to transparent and have multiple purple phantoms. The crystals are up to 20 mm on edge which is large for the location. This piece measures approximately 3 5/8 x 2 9/16 x 1 1/8 inches or 92 x 65 x 28 mm.