NRA46AN9: Very aerial group of Prehnite crystals, of good size for the locality, with crystal forms that are unusually sharp for the species, between translucent and transparent, with good luster and a greenish yellow color, on an Orthoclase matrix, associated with crystals of the Clinozoisite-Epidote (Series)
Isabel Quarry (La Saludadora Quarry), La Cabrera pluton, Valdemanco, Comarca Sierra de Guadarrama, Community of Madrid  Spain

Specimen size: 5.4 × 4.7 × 3.2 cm = 2.13” × 1.85” × 1.26”

Main crystal size: 1 × 0.9 cm = 0.39” × 0.35”