Although the Island of Mount Desert, Maine, has been the object of geological investigations for many years and by many observers, the occurrence of green microcline in moderate abundance at an easily accessible place has passed unnoticed up to the present time so far as the writer is aware. The only reference found in the literature of Maine geology and mineralogy is in Charles H. Hitchcock's Preliminary Report upon the Natural History and Geology of the State of Maine. On page 200 of this report Hitchcock refers to a granite which contains “green feldspar” near Sea Wall Point, without doubt the same locality as the one presently to be described.

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