rdh1079
off to a rocking start
Member since September 2016
Posts: 11
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Post by rdh1079 on Sept 11, 2016 21:25:09 GMT -5
Found this in the Willamette River here in Salem. Looks like a coral head to me, kind of resembles a Petoskey stone, but obviously not that being found here. Can't scratch it with a car key, gonna throw it in my rough barrel tomorrow.
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Post by cobbledstones on Sept 11, 2016 22:44:51 GMT -5
Found this in the Willamette River here in Salem. Looks like a coral head to me, kind of resembles a Petoskey stone, but obviously not that being found here. Can't scratch it with a car key, gonna throw it in my rough barrel tomorrow. That looks like agate after zeolite to me. I have found a couple in the willamette before. If you go up in the headwaters more on the coast range you can find the zeolite (sometimes calles naturalite) in basalt that looks just like the sprays you see there. The zeolite is white, and resembles coral in its river tumbled state. Depending on the mineral replacement, the white spots may undercut when tnbled, but if not it should be striking when polished.
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rdh1079
off to a rocking start
Member since September 2016
Posts: 11
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Post by rdh1079 on Sept 11, 2016 23:47:02 GMT -5
When I look at pics of zeolite in basalt the placement seems usually sporadic and spread out, with deposits ranging in sizes. The sizes of these "deposits" are pretty uniform and packed tightly together like a coral colony. My previous hobby (obsession) was reef aquariums, and this looks a lot like a coral head. I hope it tumbles! Maybe rough grit will reveal all!
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Post by cobbledstones on Sept 12, 2016 0:38:31 GMT -5
here is a cab from that material here are some of the zeolite clusters. I have found fist sized pieces that look like coral heads. They are plentiful, but don't show up in the main stem often. I think they are too soft and erode away. you can tell the difference between this and coral by inspecting the sprays. This zeolite is composed of small but regular shaped crystals, coral is not.
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Post by fernwood on Sept 13, 2016 22:29:46 GMT -5
That looks like coral to me. Maybe a base nodule. Very similar to the things I had identified as coral nodules, except color is different.
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rdh1079
off to a rocking start
Member since September 2016
Posts: 11
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Post by rdh1079 on Sept 26, 2016 18:55:29 GMT -5
I think it's bird's eye rhyolite
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,487
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Post by Sabre52 on Sept 26, 2016 20:21:35 GMT -5
I'd vote rhyolite. Very similar to a lot of Bird's Eye rhyolite forms found throughout the west, and as I remember it, that is not really fossil country, more igneous deposits. That polished hunk is beautiful and very agatized...Mel
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