Binghamite Stone Slab Lapidary Rough Rock
This semiprecious stone slab of Binghamite is 6 inches by 5.6 inches and 6.5 mm thick.
The unpolished rough rock slab weighs .72 lbs. and is shown wet in the first 2 pictures.
Binghamite comes from the Cuyuna iron range in Minnesota.
The stone has areas that are highly chatoyant similar to Pietersite or Tiger's Eye. It is a quartz with fibers of goethite in colors of red, gold, black and there are also rare colors.
The best Binghamite compares with top Pietersite for color and chatoyancy. Binghamite shows crystal growth in all directions.
The Cuyuna iron range has been closed for many years and so this stone is fairly rare.
It was named after Bill Bingham, a lapidarist from St. Paul, who discovered the material on mine dumps of the area in 1936.