“Group of Gypsum crystals, one of them clearly dominant and doubly terminated, with a very distinct “swallowtail” twin and abundant inclusions, on matrix. La Dificultad Mine, Sierra Minera de Cartagena-La Unión, Portmán, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia), Spain. Found in: 1981-1985. Reference: HM160EK”

“Group of Gypsum crystals, one of them clearly dominant and doubly terminated, with a very distinct “swallowtail” twin and abundant inclusions, on matrix. La Dificultad Mine, Sierra Minera de Cartagena-La Unión, Portmán, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia), Spain. Found in: 1981-1985 Specimen size: 13.7 x 7.2 x 4.5 cm Main crystal size: 12 x 5.2 cm Reference: HM160EK”