We don't have synonyms for ulexite yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ulexine.
(n) :
(mineralogy) A white mineral with triclinic crystals, NaCaB₅O₉·8H₂O, noted for its fibers which transmit light by internal reflection, such that a piece with flat faces perpendicular to the fibers' orientation displays an image of whatever is adjacent to its other side.
(n) :
(mineralogy) A white mineral with triclinic crystals, NaCaB₅O₉·8H₂O, noted for its fibers which transmit light by internal reflection, such that a piece with flat faces perpendicular to the fibers' orientation displays an image of whatever is adjacent to its other side.