HM560NX: Group of Quartz crystals with a very short prism, good luster, and almost completely covered by a thin sheet of Siderite microcrystals.
The specimen comes from the Miguel David Martínez collection (nº 601) whose label we will send to the buyer.
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain (1990)

Specimen size: 10.7 × 9.8 × 7.3 cm = 4.21” × 3.86” × 2.87”

Main crystal size: 3.5 × 3.4 cm = 1.38” × 1.34”