grayfingers
Cave Dweller
Member since November 2007
Posts: 4,575
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Post by grayfingers on Jan 30, 2014 12:11:38 GMT -5
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kaldorlon
spending too much on rocks
Member since October 2013
Posts: 413
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Post by kaldorlon on Jan 30, 2014 13:52:18 GMT -5
sweet!
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Post by Hard Rock Cafe on Jan 30, 2014 16:11:36 GMT -5
Really nice. I've got a bucket to cut. I never considered fractures because most of the rocks I have don't have visible ones. Now I think they're just hiding.
Chuck
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Post by pghram on Jan 30, 2014 23:03:27 GMT -5
Nice ones, I especially like the one in the 4th photo.
Rich
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Post by roy on Jan 30, 2014 23:06:00 GMT -5
got to love those montana agates
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,560
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Post by jamesp on Jan 31, 2014 9:30:51 GMT -5
Those crescent shaped fractures in the surface look like higher speed impacts. Oh yea, your washes are fast enough
to cause those. I get those in a tall tumbler that i trashed. So fast current could slam those rocks at that speed and faster.
The Rio pebbles did not have such pronounced crescent fractures. But i do not think the path they follow is as steep.
I wonder if there is a correlation.
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grayfingers
Cave Dweller
Member since November 2007
Posts: 4,575
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Post by grayfingers on Jan 31, 2014 10:51:33 GMT -5
Those crescent shaped fractures in the surface look like higher speed impacts. Oh yea, your washes are fast enough to cause those. I get those in a tall tumbler that i trashed. So fast current could slam those rocks at that speed and faster. The Rio pebbles did not have such pronounced crescent fractures. But i do not think the path they follow is as steep. I wonder if there is a correlation. James, they get a good tumbling all-right. I do not believe they are tumbled down as much as some think. I find a lot of agates with very crisp impressions from the irregularities in the lava mold. Also find pet wood with bark still intact. . . I believe the agates were formed in numerous events, thus the difference in minerals one sees in the stones. Check out the video below of the upper Yellowstone, just north of the park where it is still a small mountain river. It does lose a lot of elevation between the edge of the Rockies and ND. There is good wood in this area. There is a basin to the southwest with petrified forests. They have limited the collecting in a reasonable manner, small fee and a 25 lb limit. (The Tom Miner Basin, which is federal public lands managed by the United States Forest Service, contains a petrified forest. The Eocene era petrified forest is between 55 and 35 million years old. The site is unique because many of the fossilized trees are vertical.) For those curious about Jim. . . www.nwhistorycourse.org/ttcourse/Year2/unit3/week11/peoplewho.htmlSame canyon in summer, good fishin. One can see how much high water bank there is.
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Post by 1dave on Jan 31, 2014 12:05:35 GMT -5
Ever stood on a river bank after a heavy rain and felt the ground vibrate as big boulders tumble down the river bed? Scary!
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,560
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Post by jamesp on Jan 31, 2014 17:08:06 GMT -5
James, they get a good tumbling all-right. I do not believe they are tumbled down as much as some think. I find a lot of agates with very crisp impressions from the irregularities in the lava mold. Also find pet wood with bark still intact. . . I believe the agates were formed in numerous events, thus the difference in minerals one sees in the stones. Read more: forum.rocktumblinghobby.com/thread/64066/mt-nodules-1?page=1&scrollTo=723849#ixzz2s149AsE4That is rugged territory. I would think you would have high land agates and woods caught in those nooks and crannies. If the trees are still standing or laying where they fell then that seems like it would be somewhat unchanged for where it lived. Tose rivers are rolling along fast.
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bsky4463
fully equipped rock polisher
Member since September 2013
Posts: 1,696
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Post by bsky4463 on Feb 4, 2014 13:25:27 GMT -5
Missed this post earlier (been out of it I guess)....Great MTs Bill. You get more done with that tile saw, then most do with a full lapidary shop! Cheers
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