Granite & Gneiss

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Alpine Granite comes from a formation called Swankane gneiss. The formation sits on the western edge of the North Cascade subcontinent and is bordered by plateau basalt to the east. This rock is estimated to have metamorphosed about 100 million years ago. A striking and signature element of Alpine Granite is the dikes of white pegmatite that streak the formation.

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The Antique White Granite is part of a series of intrusion than rose through the crust about 45 million years ago. These deposits can be found in eastern and western regions of Washington. These deposits are closely related to the large Idaho Batholith formation. White feldspar and black biotite mica speckles.

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