RT Book, Section T1 Malachite pigment of spherical particle form A1 Heydenreich, Gunnar A1 Spring, Marika A1 Stillhammerova, Martina A1 Pina Martínez, Carlos Manuel AB Malachite of spherulitic particle form is generally thought to be synthetic in origin. However, it could be mineral malachite formed by natural precipitation from flowing water. Agricola described a source of this type in Neusohl (Banská Bystrica, Slovakia) in 1546. This hypothesis was considered by evaluation of historical documentary sources on green pigment production in the Neusohl region, and the geological literature. Precipitation experiments imitating the natural conditions produced malachite of spherulitic form, and several wall paintings in Neusohl were found to contain spherulitic malachite. Evidence that these, and examples from Italian paintings, could be from a naturally precipitated source is presented. PB James & James SN 9781844072538 YR 2005 FD 2005 LK https://hdl.handle.net/20.500.14352/53623 UL https://hdl.handle.net/20.500.14352/53623 LA eng DS Docta Complutense RD 7 abr 2025