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Dwarves' Earth Treasures Online Museum:
Iroquois Datolites
Iroquois Mine, Cliff, Keweenaw CO., Michigan
Field-collecting Status: Private Property.

.    Iroquois Mine was one of few recent mines to be opened (1949) for exploration purposes. They hit on a seam of datolites andt dumped them on the piles. Most of the datolites found there are white, and some came with gray, and orange to pink dots. The mine dump had been bulldozed only few times I advise against bringing any metal detectors to the mine dumps for the prehnite rocks are quite rich in bits of copper. 

You can click on the pictures to see larger pictures.

datolite datolite

"Snowman" datolite with rare orange dots
datolite datolite

"Mittens" Datolite,

datolite

Fragment with Pink dots