Pyrobitumen from Asturias, Spain
Spain | |
| Josep Sanchez Lafuente i Mariol (INTAN) specimens |
| Manuel Gutierrez Claverol, Carlos Luque Cabal, Jose Ramon Garcia Alvarez and Luis Miguel Rodriguez Terente (2009) La Fluorita - un siglo de mineria en Asturias. p114. |
Berbes mining area, Ribadesella, Asturias, Spain