Purple Fluorite Cubes, Mapimi, Durango - Cobalt blue cubes of fluorite crystals, purple that tends towards blue, from Mina Ojuela in Mapimi, Durango. Shot through the glass display case, the central crystal measures about 3/8” square.
The many color variations of Fluorite. Pure fluorite is actually colorless; its impurities are what gives it its wide variety of colors. Also shown above is the often octohedral or cubic nature of the crystals.