1.67" Chatoyant Binghamite Agate Cabochon - Minnesota

This is a beautiful binghamite cabochon that was collected from the Cuyuna Iron Range in Crow Wing County, Minnesota. It is shaped and polished to a mirror-finish and features vibrant and chatoyant red and yellow coloration. There are also sections of iron and/or iron oxide that exhibit beautiful metallic luster. Pictures truly don't do this specimen justice.

Binghamite, also known as "silkstone" or "cuyunite", is a highly sought after variety of agate that is only found near the Cuyuna iron range in Crow Wing County, Minnesota. It often displays vibrant red, orange, and yellow colors and in some cases contains small veins of iron running throughout the agate. Many specimens have chatoyant properties that are similar to tiger's eye. The chatoyance can be attributed to the fibrous hematite and goethite parallel crystal formations that the agate deposits around.

Agate is a variety of microcrystalline quartz (chalcedony) that displays translucence and, in some cases, banding. Agate primarily forms when silica-rich fluids fill pockets within rocks and/or fossils, depositing the silica along the walls of the rock. This process can result in banding patterns, as the compositions and impurities of these depositing fluids change over time. These banding patterns can either form as flat layers, creating linear patterns known as waterline agate, or as rounded layers, forming more common ring-like patterns. These patterns depend on the surfaces available for deposition.

FOR SALE
$29
DETAILS
SPECIES
Chalcedony var. Agate, Hematite & Goethite
LOCATION
Cuyuna Iron Range, Crow Wing County, Minnesota
SIZE
1.67 x 1", .3" thick
CATEGORY
SUB CATEGORY
ITEM
#195144