Binghamite and Silkstone came 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. When the stone's pattern is arranged in level lines it is called Silkstone.
Binghamite shows crystal growth in all directions. The Cuyuna iron range has been closed for many years and so this stone is fairly rare. You will need to saw the gemmy chatoyant areas out of this rough.
There is considerable waste with some slabs ... all parcels will cut gemstone cabochons.
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