Mundo de Cristal (English: Crystal World) is the second studio album by Mexican singer Thalía, released in Mexico on 26 September 1991, by Fonovisa Records. It was Thalía's second and last album to be produced by Alfredo Díaz Ordaz, who was her boyfriend at that time and died of hepatitis in 1993. Mundo de Cristal was certified 2× Gold in Mexico for shipments of 200,000 units. The most successful singles from the album were "Sudor", "En La Intimidad" and "Fuego Cruzado". To celebrate Thalía's 25th anniversary as a solo artist, this album is available in the digital platforms iTunes and Spotify since December 2014.