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Dwarves' Earth Treasures Online Museum:
Keweenaw Point Datolites
Keweenaw Point and Highrock bay of Michigan
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.      Bright yellow datolites were brought up by scuba divers just off Keweenaw Point and their color made them one of the most converted datolites coming from Michigan. Also, datolites have occasionally be found as rounded pebbles along the pebbly beaches of Keweenaw Point and Highrock Bay as well as the fact that there is a seam of yellowish datolite in-site one of the cliff south of Highrock Bay. I haven't been able to get to that seam yet.

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Strong orangish yellow color,
found on beach, rounded by waves
From a seam south of Highrock bay
 
Found underwater at Keweenaw Point