Quartz with Siderite and Quartz (variety chalcedony)

San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain

Specimen size: 6.4 × 5 × 4.4 cm = 2.52” × 1.97” × 1.73”
Main crystal size: 4.1 × 2.5 cm = 1.61” × 0.98”