4N58: Aggregate of spheroidal growths of Prehnite crystals, translucent, lustrous, and pale yellowish green. Partially coated with thin tabular crystals of white Calcite. With microcrystals of Epidote-Clinozoisite.
(La Cabrera pluton), La Cabrera, Comarca Sierra Norte, Community of Madrid  Spain

Specimen size: 5.0 × 3.6 cm = 1.97” × 1.42”