Silkstone is a quartz gemstone, a special fibrous variety of Tiger Eye. It has a “grain” like wood, takes a fabulous polish, is easy to work with, and yields incredible cabs. Silkstone is similar to Binghamite and was sometimes found in the same veins. Basically it is fibrous quartz in which the replaced fibers are a red hematite and yellow goethite iron. Colors include yellow, brown, green, blue and red. This material is getting harder and harder to find and good specimens are very expensive.The stone has areas that are highly chatoyant similar to pietersite or tiger’s eye.
This material is found only on the Cuyuna iron range (near Crosby) in Crow Wing County, Minnesota. 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.
Please enlarge and view the photographs for more detailed views. Shown wet to simulate polish. As with all natural rock, there may be fractures or pits to seal or work around. Each slab has the approximate dimensions listed. I use the longest and widest point and the thinnest, it’s not averaged. We have worked hard with the lighting and the settings on the camera so that the colors are very accurate. Individual settings may affect color viewing on various devices and I cannot predict what your device will do, but on my Macbook Pro, they’re dead on for color. I appreciate your business!