<p>The name "Pictured Rocks" comes from the streaks of mineral stain that decorate the cliffs. Stunning colors occur when groundwater oozes out of cracks and trickles down the rock face. Iron (red and orange), copper (blue and green), manganese (brown and black), and limonite (white) are among the most common color-producing minerals.</p>
<p>Cliff wall along the Lake Superior shoreline at Pictured Rocks National Lakeshore</p>
<ul><li>Keywords: Pictured Rocks National Lakeshore; piro; pictured rocks; sandstone; lake superior; color; minerals; cliffs; erosion</li></ul>
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