This beautiful agate specimen has been cut and polished to perfection.
Measures approx 4" x 5"
Agate is a type of microcrystalline quartz that displays translucence in many colors which is the result of the minerals present in the silica. In Stone cases, the formations will display layered banding, and even a rainbow prism called iris. Agate generally forms by the deposition of silica from groundwater in hollow cavities of volcanic rocks.
The agates from Brazil are mined around Rio Grande do Sul from ancient from decomposed volcanic ash and basalt from the late Permian age (248-275 million years ago).