Spectacular plate polished on one side of ± 6.2 x 3.8 cm. Intense and very bright color.
The "eye" effect is due to a parallel growth of amphibole fibers (Riebeckite) and the yellow-brown color comes from the oxidation of these fibers to limonite.
"Marra Mamba iron formation" northwest of Newman in the Pilbara region, Western Australia.
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