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Dwarves' Earth Treasures Online Museum:
Isle Royale Datolites
From the old mines and offshore areas of Isle Royale, Michigan
Field-collecting Status:  National Park, No Collecting!

.      It appears that few people did visit Isle Royale island in the past and collected some datolites from the mine pits before the federal government placed a ban on any rock collecting on the island. The old collection of datolites from the pits of Isle Royale recently showed up and I was able to obtain few datolites from it. Most datolites seem to be white with pink centers and few coming with orange and yellow colors.
    Also, some people collected a bunch of datolites while scuba-diving before the ban was in full effect and many colorless to light green datolites with prehnite inclusions were collected while few bright-colored datolites were found.

You can click on the pictures to see larger pictures.

Offshore of Isle Royale
One of many datolites collected during
the scuba diving offshore Isle Royale
datolite

datolite

datolite

datolite

datolite