8.9" Cut Agate Nodule On Metal Stand

Words can barely describe how beautiful this specimen is in person.It is a white and red-orange agate nodule from Brazil, which has been cut open, polished, and mounted on a stand allowing both halves to be displayed. The agate has a nice bright tone with a big quartz crystal ring encircling a druzy crystal pocket.

The base dimensions are 8.9 x 7.4 x 3.2". The dimensions of the lid are 8.6 x 7 x 3.5". On the stand, the entire specimen is 10.45" tall.

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.

FOR SALE
$525
DETAILS
SPECIES
Chalcedony var. Agate
LOCATION
Brazil
SIZE
8.9" wide, 3.2" deep, 10.45" tall (on stand)
CATEGORY
SUB CATEGORY
ITEM
#207009