- Calcite, Quartz (Var: Amethyst)
- Large Cabinet, 17.5 x 11.5 x 11.5 cm
- Irai, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil
Sharp, silky, translucent crystals of calcite, compound crystals with multiple terminations at each end, have grown right on top of a cluster of glassy, lustrous deep purple amethyst. The calcite measures 12 cm across.