Gary Green Jasper, also known as Larsonite, is found in Malheur County, Oregon near the town of McDermitt on the border with Nevada. It is associated with the volcanic deposits of the Pacific Northwest. It is different from many jaspers in that it has been interpreted to be a silicified bog deposit. The bog formed in the vicinity of the volcanic activity and was later covered by volcanic rocks that supplied silica to the ground water system. The silica was redeposited from the ground water into the bog sediments, replacing and preserving the original material with jasper.
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