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Dwarves' Earth Treasures Online Museum:
Clark Datolites
Clark Mine, Copper Harbor, Keweenaw CO., Michigan
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    The Clark Mine is one of most well-known and most visited mine for the datolites that it was mentioned even in many old books on collecting in Michigan and even today, it is still being visited by many people. With an exception of illegal attempt at bulldozing (he was caught), it's one of very few mines that I know of that had not been bulldozed. Many datolites from Clark Mine are white and  some consist of many datolite nodules squeezed together. I'm starting to see some orange datolites from Clark Mine but I'm starting to discover that some people mislabelled the datolites on purpose.

Typical examples of small datolites from Clark.
Found by Jeffrey Anderson, August 2008.
Greenish color, August 2009 Greenish hue, August 2009
Typical datolite from Clark Mine Multi-nodules squeezed together.

Desired type of datolite from Clark Mine.