4" Polished Agate Nodule with Wegeler Effect - Agouim, Morocco

This is a cut and polished agate nodule end cut that was collected from Agouim, Morocco. The white and translucent banding of this agate results in this specimen exhibiting a wegeler effect when rotated.

Comes with an acrylic display stand.

The wegeler effect, also known as the shadow effect or parallax effect, is a three-dimensional oddity in which rotating the agate results in the appearance of lines that move. One line will move with the source of light while the other moves with your point of view. This occurs in agate that has tightly packed, alternating bright opaque bands and transparent bands.

This site in Agouim, Morocco produces a wide variety of agate and jasper formation, with "jasper agates", "banded floater agates" surrounded in quartz and ribbon agates being some of the highly sought after specimens. In addition, there are a diverse selection of other agates that are often confused visually with those from other sites like Aouli and Kerrouchen.

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 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.

Chalcedony var. Agate
Agouim, Ouarzazate Province, Drâa-Tafilalet Region, Morocco
4 x 2.45", up to 1.7"