"Gemstones of the World" Walter Schumann lists Binghamite as a 'rarity for collectors'
This is an especially nice slab of Binghamite - lots of action ! Photographed wet, so until polished or treated, the stone will appear less vibrant. approx 5.1/4 X 3.1/2 X 3/8" thick Collected in the 1960s
"Mining in the area uncovered deposits of the stone, but since mining operations were discontinued in the area many years ago the stone has become rare and is sought after by lapidarists and gem collectors. The stone has areas that are highly chatoyant similar to pietersite or tiger's eye. It is a variety of quartz with fibers of goethite or hematite usually in colors of red, gold, and black. The best binghamite compares will top pietersite for color and chatoyancy. When the stone's pattern is arranged in level lines it is called silkstone. Binghamite shows crystal growth in all directions. It is named after William Bingham, a lapidary, who discovered it in 1936. (from Wikipedia)