benh7777
off to a rocking start
Member since July 2016
Posts: 4
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Post by benh7777 on Jul 28, 2016 23:21:11 GMT -5
Newbies first post.......
This is a cool board, glad I came across it. Lots of interesting stuff here.
Living in central Oregon (Bend) I am lucky to have countless public areas close to my disposal for rock hounding but my favorite is heading to the coast and collecting beach agates. I never get tired of walking the beach, usually I end up heading back only because every pocket in my pants, shirt, coat and anything else I can stuff agates in are full and weighing me down. Then I can't wait to get home and throw them in the tumbler.
Gleneden Beach is my favorite beach to look for agates. I will post some pics later of some of my tumbled agates.
My biggest challenge is getting all that white crap, whatever it's called, off of the agates. Sometimes it can take 3-4 rounds of stage 1 tumbling and knocking the size of the agate down by half to get through it all. Sometimes for the sake of keeping most of the agate in tact I must settle with a few spots or streaks of it on before polishing them.
I'm no expert on types of agate I find, I just love opening the tumbler after that final polishing stage, I can sit there for hours inspecting each agate.
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Post by vegasjames on Jul 29, 2016 0:48:01 GMT -5
Calcium carbonate can be easily removed with an acid like hydrochloric (muriatic) acid or soaking in vinegar.
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Post by Peruano on Jul 29, 2016 7:18:24 GMT -5
I'm going to suppose that "something" that is white and very hard to remove from the surface of agates is probably something harder than calcium carbonate. Possibly its the white oxidized patina that is probably agate too, but just develops where the agate is exposed to uv and oxygen. That white surface stuff is one of the easiest ways for me to recognize agate in the desert environs of New Mexico. And yes it takes a long time to remove in a tumbler. Acid won't touch it. So that's another possibility.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,718
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Post by Fossilman on Jul 29, 2016 8:46:11 GMT -5
Welcome benh7777.... We were just in Bend the other day.....WE are in Dallas..Yes the beach is an awesome place...Lots of rocks and fossils..
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benh7777
off to a rocking start
Member since July 2016
Posts: 4
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Post by benh7777 on Jul 29, 2016 10:44:49 GMT -5
I'm going to suppose that "something" that is white and very hard to remove from the surface of agates is probably something harder than calcium carbonate. Possibly its the white oxidized patina that is probably agate too, but just develops where the agate is exposed to uv and oxygen. That white surface stuff is one of the easiest ways for me to recognize agate in the desert environs of New Mexico. And yes it takes a long time to remove in a tumbler. Acid won't touch it. So that's another possibility. Definitely is super hard. I've tried grinding and sometimes helps some. It is also an easy way to spot agates on the beach for me as well as it seems only the agates has it on the surface, I've found agates completely covered with it before.
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benh7777
off to a rocking start
Member since July 2016
Posts: 4
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Post by benh7777 on Jul 29, 2016 12:17:58 GMT -5
Yes it definitely polishes.
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