Unusual twinning features in large primary gypsum crystals formed in salt lake conditions, Middle Miocene, Madrid Basin, Spain-palaeoenvironmental implications

1. Rodríguez-Aranda, J.P.
2. Rouchy, J.M.
3. Calvo, J.P.
4. Ordóñez, S.
5. García del Cura, M.A.