FLUORITE, CaF₂ - Calcium Fluorite. This specimen is a little different as it has a lot going on. It is a  grouping of green quartz crystals and calcite crystals and in the middle is a nice sharp purple Fluorite cube. The back of the matrix is covered in small galena crystals. From Naica, Chihuahua, Mexico. The specimen is 8.5 cm (3-3/8") wide by 6 cm (2-3/8") deep by 3.4 cm (1-3/8") high. The Fluorite crystal is 1.5 cm (5/8") on edge.A fine specimen.