Bayldonite

Bayldonite is a rare lead and copper arsenate mineral, sought after for its crystals and crusts in shades of olive green, apple green to dark green. It forms in the oxidation zones of lead and copper deposits, often in association with mimetite, duftite, cerussite, or malachite. The finest specimens, particularly from Morocco, Namibia, and the United Kingdom, are highly prized by collectors for their intense color and rarity.