Ulexite has the chemical name hydrated sodium calcium borate hydroxide. Its composition is
NaCaB5O6(OH)6-5H2O
The origin of this sample of ulexite is Boron, California. Popularly called "TV stone" or "TV rock", it is transparent along the direction of the parallel fibers which form the mineral, but translucent in the perpendicular direction. This sample is about 3 x 2.3 x 0.8 cm.
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