Quartz coated by Quartz (variety chalcedony)

Los Pajaritos-Cabezo de Don Juan Ravine, Llano del Beal, Cartagena, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain

Specimen size: 12.8 × 9.5 × 7.7 cm = 5.04” × 3.74” × 3.03”
Main crystal size: 5.7 × 4.6 cm = 2.24” × 1.81”