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The specimen was collected from the Oregon Dome Massif. The Oregon Dome is similar in all respects to the anorthosites described and analyzed by Buddington (1939) for the Adirondack High Peaks region (Marcy Massif). Texturally, the present specimens…

Mined and marketed under the name "Aplite"

Fine-banded, most of the bands are several inches wide and alternate light-dark