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Dwarves' Earth Treasures Online Museum:
Drexel Datolites
Drexel Mine, Delaware, Keweenaw CO., Michigan
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    Drexel (Drexal/Drexil?) Mine is obviously a failed attempt to locate the copper rich lobes since the mine dump is very small and the datolites started showing up from that mine dump recently. While most datolites are white to opaque gray, few datolites are similar to those of Delaware (pink color) found there and it happens that Drexel Mine is just a mile (or two?) west of Delaware Mine and Connecticut Mine. Some datolites also include some copper inclusions. I managed to find few datolites at one spot at Drexel mine and there may be few more waiting to be found. As of August 2010, few people appeared to have hit on big nest of numerous larger datolites at one spot but most seem to have come up white to gray with some greenish coloring while I'm still finding small but colorful datolites at one different spot. So it's obvious that the miners dug out at least two seams of datolites during their mining expeditions.

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Small sizes but great variety of colors! All found by Jeffrey Anderson, August 2008

Orange double-chambered datolite
found by JA, August 2009		 Few more small datolites that are not gray.
found by JA, August 2009		 Orangish datolites in mudrock,
found by JA, August 2010
Typical white multi-chambered datolite,
Found by Jeffrey Anderson, August 2008		 Has anyone ever found 
a red & yellow datolite at Drexel?!?!
Found by Jeffrey A., August 2008		 Orange to gray with dots
found by JA, August 2010
Rare datolite with red dots.
(I bought that one)		 Large(finally!) datolite with greenish hue,
found by JeffreyA., August 2010		 More small and colorful datolites
found by JA, August 2010
Typical opaque datolites,
found by JeffreyA., August 2007		 Rare colored datolites
some with copper inclusions.		 Rotten green datolite
found by JA, August 2010
Typically gray datolites
found by JA, August 2010		 White datolite,
found by JA, August 2008		 White datolite,
found by JA, August 2010