- Binghamite
Binghamite (also called silkstone and cyunite) is a type of
agate stone found only on theCuyuna iron range (near Crosby) in Crow Wing County,Minnesota . The formation of the stone occurs near deposits ofiron ore .Description
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 fairly rare and is sought after by lapidarists and gem collectors. The stone has areas that are highly chatoyant similar to
Pietersite orTiger's Eye . It is aquartz with fibers ofgoethite usually in colors of red, gold, and black. 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. It is named after Bill Bingham, alapidarist , who discovered it in 1936.References
*cite book |last= Schumann|first=Walter |title=Gemstones of the World |year=2007 |publisher=Sterling Publishing Company, Inc. |isbn=1402740166
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