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Post by fernwood on Oct 27, 2020 5:27:08 GMT -5
Was purging old Rock photos from my computer and came across these. The rock was found in the Spring of 2016 at the location on my Avatar. It is about 3" wide by 3.25" tall. My first thought is to face polish. This was sticking up in the field. Turned it over and this appeared. Hard to tell how deep the banding is. It appears pretty thin. So what would you do? Face polish? Try slabbing and see what happens? Something else? Thanks.
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Post by fernwood on Oct 27, 2020 6:29:14 GMT -5
Just checked. The agate formations are between 0 and 3 mm's above matrix, which appears to be Jasper like. There is some other areas of typical, soft crusting found in Niagara Escarpment fossils/rocks.
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kyoti
has rocks in the head
Member since June 2020
Posts: 542
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Post by kyoti on Oct 28, 2020 6:50:01 GMT -5
Hmm that's a tough choice. When I find a specimen type rock with thin sections of color, I've been using the tile saw or dremel to shave off just the crust on a side so I can polish it. I've had great success but sometimes I've also accidently shaved off the pattern I was wanting to keep. The nice thing about a dremel is that you can control it more easily but if the rock is large, it will be slow going. It's posssible that your rock's patterns continue into the rock. You could always slab a piece of the bottom as a test. Then the rock will sit flat and still look natural on top.
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Jahic
starting to spend too much on rocks
Member since September 2020
Posts: 139
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Post by Jahic on Oct 29, 2020 13:12:07 GMT -5
I really enjoy prices with uneven polished surfaces. Taking how you have it in those pictures and just polishing the ground faces would look really cool to me.
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NevadaBill
fully equipped rock polisher
Member since January 2019
Posts: 1,332
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Post by NevadaBill on Nov 12, 2020 12:35:14 GMT -5
I am no expert, but I think it would undercut like crazy. I would throw it in to the tumbler and allow Stage 1 to shape it a good deal. Then I would polish up the exterior of the stone with a grinder, running it through the various wheels, and probably finish polish it by hand using a Dremel tool.
I have a bunch of similar rocks to this which are filled with colorful swirls of agate, mixed with a conglomerate of other really poor chert or even softer filler material. And I can't tumble it the whole way because of the software rocks undercutting.
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