rainbow gneiss

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Maryland Geological Survey: A Geologic Walking Tour of Building Stones of Downtown Baltimore, Maryland
... the pedestals for the flag poles are faced with “Rainbow Gneiss” (also known as Morton Gneiss) from Morton, Minnesota (Figures 10a and 10b). This gneiss is about 3.6 billion years old, one of ... “Rainbow Gneiss” on the west wall of the City of Baltimore Police Headquarters (Stop 10); photo width corresponds to a distance of about 12 feet. Figure 10b: A close-up of the “Rainbow Gneiss ...
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