.	Dwarves' Earth Treasures Online Museum: Hill Fissure Datolites Vicinity of Copper Falls, Keweenaw CO., Michigan	.

    The Hill Fissure is the one hidden in the forest behind the Rest Area within the vicinity of Copper Falls and it is bit tricky to find it since the diggings are hidden behind a hill which seem more like a mine tailing. The area was pretty heavily dug out by so many datolite collectors and not much has been found despite my efforts to clear the junk rocks off the now depleted seam, and in August 2007, I decided to come back to this area to give it another chance. I happen to take a wrong turn and ended up in the place loaded with datolite enriched rocks where very sparse digging had been done. As a result, I was able to obtain so many "mudrocks" containing datolites which are mostly white due to bleaching but I have found some with orange dots, greenish tints and even yellow ones! It takes a lot of cutting and grinding to find those with some colors.
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All datolites are found by Jeffrey Anderson

"William Taft Stuck in a bathtub" August 2009	Another typical datolite with unbleached areas (grayish) August 2007
A couple of rare yellow datolites August 2007	Gray datolites August 2007
With reddish dots along the edges August 2007	Rare very dark datolite from old diggings, August 1995
Contains rare greenish datolites August 2007	Both Contain red dots August 2007
Typical white datolite in its  unusually large size in the basaltic mudrock	Semi-orangish datolites (contains lot of reddish-orange dots) August 2007