Ulexite or hayesine is an evaporate mineral and an ore of boron. It is formed during the evaporation of lake basins and occurs in white rounded crystalline masses. It is a hydrous borate of lime and soda and has a relative hardness of 2. Ulexite was named in honour of George Ulex, the German chemist who in 1850 first correctly analysed the mineral. One transparent variety of ulexite exhibits the rare property of transmitting light unaltered from one end of its crystals to the other. Ulexite is utilized as a source of boracic acid, and for glass and pottery manufacture. Research Ulexite
 
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