The mysterious Le trésorier de philosophie naturelle des pierres précieuses includes texts forbidden by the Church and suspected of containing illicit powers. The manuscript belonged to Raphael de Mercatellis, the powerful Abbot of St. Bavos and one of the most important Renaissance bibliophiles of the Low Countries. It is composed of separate sections comprising fascinating texts that illustrate Mercatellis' medicinal, Platonic, and occult interests. 

Please also read our blog posts on this manuscript.