mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
1 item @ $25.00  

Ulexite Colemanite

#PD30652

Ulexite Colemanite

#PD30652
Availability
Sold
Size
10 x 6 x 6 cm - Cabinet 
Formula
NaCaB5O6(OH)6·5H2O (RRUFF)
Locality
Boron, Kern Co., California, United States
Tagged
Ore Minerals

An excellent specimen showing the fibrous nature of Ulexite used in fiber optics. Also called "TV rock" Ulexite as the remarkable property of transferring light through its fibers by the refraction of light even when bent.

Ulexite

Formula
NaCaB5O6(OH)6·5H2
Crystal System
Triclinic 
Crystal Habit
Acicular, Fibrous, Capillary 
Cleavage
Perfect, Perfect, None 
Luster
Chatoyant 
Color
colorless, white 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
View Ulexite
On Dakota Matrix
Previously Sold Ulexite
On Dakota Matrix
Other Available Ulexite
WebMineral
View Ulexite
Mindat
View Ulexite

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2025 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map