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Dwarves' Earth Treasures Online Museum:
Lake Superior Datolites
Shorelines of Keweenaw Peninsula & Isle Royale

.      The datolites have been found along the shores of Lake Superior around the Keweenaw Peninsula and Isle Royale island, and a number have been found by scuba divers. The shores of Isle Royale island had produced many excellent datolite nodules with some being quite colorful and large, but right now, the island is closed to any collecting (there goes the top quality greenstones!).

You can click on the pictures to see larger pictures.
datolite
Large specimen,
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Large specimen, picked up by Bob Barron
Reddish, picked up by Bob Barron orange, picked up by Bob Barron
datolite datolite datolite
Bright colors, picked up by Bob Barron Weathered colors
red, picked up by Bob Barron
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datolite

picked up by Bob Barron picked up by Bob Barron Large Slab