Quartz (variety amethyst) epitactic Calcite

La Soberana Quarry, Catalán Grande area, Artigas Department  Uruguay (09/2011)

Specimen size: 19.5 × 18 × 14 cm = 7.7” × 7.1” × 5.5”
Main crystal size: 8 × 5.3 cm = 3.1” × 2.1”