Mirabilite, also known as Glauber`s salt, is a hydrous sodium sulfate mineral with the chemical formula Na2SO4·10H2O. It is a vitreous, colorless to white monoclinic mineral that forms as an evaporite from sodium sulfate-bearing brines. It is found around saline springs and along saline playa lakes. Associated minerals include gypsum, halite, th.... Found on http://en.wikipedia.org/wiki/Mirabilite
a widespread sulfate mineral, hydrated sodium sulfate (Na2SO410H2O), that forms efflorescences and crusts, particularly in arid regions. It occurs ... Found on http://www.britannica.com/eb/a-z/m/98