Porphyry Island – Canadian Lighthouses of Lake Superior

Just east of Thunder Bay on Lake Superior’s northern shore, Canada, lies the volcanic Black Bay Peninsula that separates Black Bay and Nipigon Bay, and consists of over 300 distinct lava flows. Porphyry Island is the last in a chain of islands that stretch southwest from the peninsula and is named for the island’s igneous rock, known as porphyry, that contains quartz and feldspar crystals. Another unique peculiarity of the island is the presence of the so-called devil’s club, a shrub with a spiny stem and large leaves. Porphyry Island…

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