The Legend of Sandy Lake

According to the Ojibwa Indians, two teen lovers were canoeing across the lake one day, when they capsized and the young woman drowned. 

To free her spirit, the devastated young man cut out her heart and threw it into the water, where it was transformed into a huge, heart-shaped rock that still lies at the bottom. 

On sunny days, this stone glows with a purplish hue.