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Delaware Datolites found by JA
Delaware Mine, Delaware, Keweenaw Co., Michigan
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    I hadn't had luck of finding any datolites until August 2003 when I started finding small datolites "marbles" from one location which all are gray to white. Over time I started exploring the mine dumps and noticed that the datolites are found in concentrations. That tells me that each time the miners hit on a datolite seam, they would mine them out and dump them in one place. If they hit another seam, they take them out and dump them in a different place. After exploring and collecting, it seemed that the Delaware Mine may had at least three seams of datolites (datolite "Marbles", rare yellow datolites, red datolites, and white datolites with red-pink spots).
    At August 2005, I finally found five colored datolites (red and orange) at one location, and I could have found more if it hasn't started raining. I came back to the Delaware Mine in August 2006 only to discover that two of my favorite "spots" had been buried by all of the excessive bulldozing and I was upset. I know they were trying to find the concentration of red datolites, but I don't like the way it was bulldozed (they should had bulldozed the rocks away from the mine, NOT toward it). In spite of this setback, I continued exploring around trying to re-discover my favorite spots and found two large ones in plain sight. As of August 2007, I found only two "marbles" and the datolites seem to be scattered randomly due to too much bulldozing. I finally hit on a spot in August 2008 where I was able to find a good number of colorful datolites including Plume Red and Lemon Yellow ones!


Small datolites found by Jeffrey Anderson, August 2008

Plum Red Datolite, August 2008 Citrus Orange Datolite,
August 2005		 Lemon Yellow Datolite
August 2008
Mult-chambered red datolite
August 2008		 Red wtih White rims, August 2008 Salmon Colored, August 2008

Typical white nodule but with interesting patterns,
from Datolite "Marble" site, buried by 2006 bulldozing
August 2004		 Pink Datolite, from JA's favorite spot 
(buried by 2006 bulldozing)
August 2005		 Red datolites from JA's favorite spot 
(buried by 2006 bulldozing) August 2005
Datolite "Marble" with "blood vein"
August 2004		 Spotty pattern,
August 2006		 Grayish (purplish?) datolite,
August 2006
One of  several largest datolites found so far, red dots
August 2006		 One of several largest datolites found so far
August 2006
Faint Salmon colored, August 2009 Faint Salmon colored, August 2009

Red dotted white datolite, August 2009