• (...) In their study, researchers from the School of Earth and Environment at the University of Leeds in the United Kingdom and from the Laboratorio de Estudios Cristalográficos CSIC-University of Granada in Spain discovered that gypsum, which is also referred to as Plaster of Paris, begins as small crystals of the bassanite mineral. Gypsum is used in construction, casts, fireproofing and even artwork.
  http://sl.ugr.es/01Wb