These crystals, while not natural, are nonetheless very interesting to the mineral hobbyist and to others. The unique look that these clusters offer is really indescribable. Its color consisits of iridescent metallic yellow, blue and green hues. Just the edges extend outward from the center of the crystal leaving hollow stairstep faces between these edges. The hopper crystals form due to the disparity of growth rates between the crystal edges and the crystal faces.
Color is silver white often with a multi-colored iridescent tarnish.
Luster is metallic. Crystals are opaque. Laboratory grown crystals display trigonal hopper crystals that appear pseudocubic. Fracture is uneven or jagged. Streak is silver to white.