Abstract

Manganian, ferrian andalusite (viridine) occurs abundantly in kyanite-hematite quartzite of the Precambrian Kiawa Mountain formation at Kiawa Mountain, Rio Arriba County, New Mexico. Its extraordinary pleochroism (golden yellow to emerald green) results from the copresence of Mn+3(Mn2O3 = 4.5%) and Fe+3(Fe2O3 = 3.0%). The andalusite apparently formed essentially contemporaneously with the kyanite.

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