//Greenstone Torch

Greenstone Torch

Greenstone Torch

Lake Superior’s Isle Royale

The tip of Isle Royale in the early spring, covered in fir and spruce.

Prehistoric native North Americans mined the remote island for copper and other minerals.  Isle Royale Greenstone (pumpellyite aka chlorastrolite) is the Michigan state gemstone.

Also found on the nearby Michigan mainland, Greenstone is popular with Upper Peninsula rock collectors but it’s illegal to remove it from the island itself because it’s a National Park.

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This photo was taken by an astronaut aboard the International Space Station during Expedition 23 in 2010.

Original (raw) image courtesy of the Earth Science and Remote Sensing Unit, NASA Johnson Space Center.

Greenstone Torch


Posters are printed edge-to-edge on
medium-weight photo paper with a
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24×36″ – $52.00
12×18″ – $30.00


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