Trancas Geode Heart from Mexico. Trancas consists of Quartz, Chalcedony & Agate. This Trancas geode heart has a beautiful appearance & features a little patch of druzy chalcedony. This heart measures roughly 3.9cm High, 4.4cm wide & 1.1cm deep. Trancas Geodes also Fluoresce under short wave UV light.