Ulexite
Ulexite

Ulexite Value, Price, and Jewelry Information


The fibrous material cuts interesting catseye cabochon gems, but they are curios only since they are much too soft and fragile for wear. The eye can be very strong, however. Sometimes ulexite occurs in seams, consisting of tightly packed parallel fibers. These are transparent along their length, and the packed aggregates act like an array of parallel glass fibers, displaying the property of fiber optics. If the material is polished perpendicular to the fiber direction, a piece of ulexite will transmit an image from the bottom of the slab to the top. For this reason the material has been nicknamed TV stone and is popular among mineral enthusiasts.

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The fibrous material cuts interesting catseye cabochon gems, but they are curios only since they are much too soft and fragile for wear. The eye can be very strong, however. Sometimes ulexite occurs in seams, consisting of tightly packed parallel fibers. These are transparent along their length, and the packed aggregates act like an array of parallel glass fibers, displaying the property of fiber optics. If the material is polished perpendicular to the fiber direction, a piece of ulexite will transmit an image from the bottom of the slab to the top. For this reason the material has been nicknamed TV stone and is popular among mineral enthusiasts.

Ulexite
By Ra'ike (see also: de:Benutzer:Ra'ike) (Own work) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons

Optics: a =1.496;= 1.505; =1.519.

Biaxial (+), 2V: 78°.

Occurrence: In playa deposits and dry lakes associated with other borates.

Nevada.

Argentina; Peru; Chile; USSR.

California: world’s major source; also source of TV stone and cabochon material.

Comments: The fibrous material cuts interesting catseye cabochon gems, but they are curios only since they are much too soft and fragile for wear. The eye can be very strong, however. Sometimes ulexite occurs in seams, consisting of tightly packed parallel fibers. These are transparent along their length, and the packed aggregates act like an array of parallel glass fibers, displaying the property of fiber optics. If the material is polished perpendicular to the fiber direction, a piece of ulexite will transmit an image from the bottom of the slab to the top. For this reason the material has been nicknamed TV stone and is popular among mineral enthusiasts.

Name: After the German chemist George L. Ulex, who first presented a correct chemical analysis of the species.


Joel E. Arem, Ph.D., FGA

Dr. Joel E. Arem has more than 60 years of experience in the world of gems and minerals. After obtaining his Ph.D. in Mineralogy from Harvard University, he has published numerous books that are still among the most widely used references and guidebooks on crystals, gems and minerals in the world.

Co-founder and President of numerous organizations, Dr. Arem has enjoyed a lifelong career in mineralogy and gemology. He has been a Smithsonian scientist and Curator, a consultant to many well-known companies and institutions, and a prolific author and speaker. Although his main activities have been as a gem cutter and dealer, his focus has always been education. joelarem.com

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