TC740EB: Druse of Quartz crystals (amethyst variety) translucent, shiny, and partially covered by two generations of what appear to be Calcite crystals, a first generation with hexagonal outlines, polycrystalline surfaces and a reddish color due to the presence of abundant Hematite crystals, and covered by a second generation of Calcite which formed pale yellow equant crystals.
Mojarra Quarry, La Bolsa area, Artigas Department  Uruguay (15/01/2007)

Specimen size: 14.8 × 9.7 × 9.6 cm = 5.83” × 3.82” × 3.78”

Main crystal size: 7.5 × 5 cm = 2.95” × 1.97”