QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,640
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Post by QuailRiver on Apr 4, 2018 22:53:44 GMT -5
I could use some I.D. help on these thundereggs. I few years ago I bought out an old collection that had a few lots of various thunder eggs. Most of them were recognizable as being from the Northwestern U.S. but the eggs from this one lot I do not recognize. The outer matrix is light tan to cream colored with some reddish orange mineral staining. The interiors of most are translucent bluish, grayish and/or white to nearly clear agate with other mineral inclusions, some of which appear to be metallic inclusions. A couple of the eggs have crystal lined vugs. Several have somewhat of a "turtleback" figure in the agate and when wet and backlit appear to want to iris a little. I'll attach photos of slices of a few of these eggs below. One with vugs: Exterior: Slice No. 1: Slice No. 1 backlit: Slice No. 2: Slice No. 3: Slice No. 4: Larry C.
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saxplayer
fully equipped rock polisher
Member since March 2018
Posts: 1,327
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Post by saxplayer on Apr 4, 2018 23:27:44 GMT -5
MMmm slice #1 backlit...
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,709
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Post by Fossilman on Apr 5, 2018 9:31:16 GMT -5
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,687
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Post by NRG on Apr 5, 2018 10:06:16 GMT -5
I have to think they are "baby Brazilians".
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 5, 2018 10:47:37 GMT -5
I tend to agree. As there is no indication of rhyolite shells or pressure deformation, these look more like geodes or vesicular nodules than thundereggs. Really nice agate interiors, though.
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