“Reference: 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, Madrid, 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””