JFD11AN5: According to what I was told, between 1998 and 1999 a very large vug was found in the granite quarries of the Sierra de Madrid, so large that you could walk inside it. This enormous cavity produced many specimens, and despite the fact that many were destroyed by the quarrying work, Madrid fans were able to collect a large number of quality specimens like this one, for which we should highlight the good number of peculiar Calcite crystals, very characteristic of this vug, as well as the Clinozoisite-Epidote Series mineral that adorns many specimens from that vug.
Isabel Quarry (La Saludadora Quarry), La Cabrera pluton, Valdemanco, Comarca Sierra de Guadarrama, Community of Madrid  Spain (02-03/1999)

Specimen size: 7.7 × 6 × 4.6 cm = 3.03” × 2.36” × 1.81”

Main crystal size: 0.7 × 0.7 cm = 0.28” × 0.28”