8.8" Cut Agate Pair With Metal Base - Brazil

This is a gorgeous agate nodule from Brazil that was cut in half and polished on one face. Both halves of the split are included in your purchase. Gray and blue bands surround a quartz ring that encircles a white and purple banded pocket. An extremely awesome display piece.

This nodule sits snuggly in a custom metal display stand that is removable should you so choose.

Agate is a translucent variety of microcrystalline quartz. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.

Agate has also been known to fill veins or cracks in volcanic rock. Such agates, when cut transversely, exhibit a succession of parallel line giving a banded appearance to the section. Such stones are known as banded agate, riband agate and striped agate.

The agates from Brazil are mined from decomposed volcanic ash and basalt from the late Permian age (248-275 million years old) In Rio Grande do Sul the "agate mines" are normally just plowed fields in which loose agates are found and collected. These agates can be very colorful and polish beautifully.
Chalcedony var. Agate
Larger Half: 8.8 x 4.45" (without base), about 3.95" thick, 12.5" tall on stand