Shannon
starting to spend too much on rocks
Member since July 2015
Posts: 145
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Post by Shannon on May 7, 2016 17:47:18 GMT -5
Went out to Pescadero today.. It rained yesterday so I was hoping there'd be some good stuff. Waves were a little rough and the tide was higher than I would've liked because my trip mates dragged their behinds. But that didn't seem to matter! Jaspers Agates ..And my favorite find! Agatized Whale Bone(?) I hope. Can anyone confirm? Thanks for looking!
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Shannon
starting to spend too much on rocks
Member since July 2015
Posts: 145
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Post by Shannon on May 7, 2016 20:49:49 GMT -5
Forgot about these: They're banded like agates... Any ideas?
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Shannon
starting to spend too much on rocks
Member since July 2015
Posts: 145
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Post by Shannon on May 7, 2016 21:41:55 GMT -5
Thanks to Henry for the collecting tips! I'm amazed how I missed the spot, it was so obvious... I guess the stairs looked kind of indistinguishable from the actual cliff and my new glasses helped with that.
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on May 7, 2016 21:44:47 GMT -5
Shannon, Man I miss that beach. I collected there and beaches nearby for 12 years. It was my therapy. Those last stones are covering my fireplace here in Utah. they look like Travertine marble. Lynn
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Shannon
starting to spend too much on rocks
Member since July 2015
Posts: 145
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Post by Shannon on May 7, 2016 22:26:25 GMT -5
Shannon , Man I miss that beach. I collected there and beaches nearby for 12 years. It was my therapy. Those last stones are covering my fireplace here in Utah. they look like Travertine marble. Lynn Pescadero is my favorite beach.. It has scenery, tidepools, and--most importantly--rockhounding! It's also the only fruitful collecting site within an hour's drive from my house. Anderson Lake is hit or miss. :/ I was thinking something along the lines of onyx! But they're pretty soft then.. I just put them in the tumbler with some much harder material, better take them out in a few days!
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Post by 150FromFundy on May 9, 2016 15:56:16 GMT -5
The agatized whalebone looks like rhyolite. The random "dots" look more like a poppy jasper than uniform bone cells. Hopefully you will get a few more opinions.
Darryl.
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Post by Peruano on May 23, 2016 11:31:21 GMT -5
I'd go with not bone (whale or otherwise). If bone you would expect more dense porosity (honeycomb effect or evidence of the actual lumen of the bone, and not just occasional vacuoles. It easily could be rhyolite and might still be worth polishing or cutting. I love beach stones. They are like processed food, in that they are easier to bring to completion, but better in the sense that you can have a better idea of the finished product instead of having to rely on the photo on the box. All stones look good when wet so I like to go on a dry day and stay above the wet line except to check on my estimation of what will appear once polished (wet is a close approximation). Oh, I almost forgot about the ones you forgot. My best guess would be to term these beach agates. They appear to be pieces of shells that have been bound together with silica (agatized). I work with a lot of material like that from Mexican beaches. Some of it is rhyolite with fancy patterns but some is indeed welded marine fossils with agate matrix holding them together.
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gemfeller
Cave Dweller
Member since June 2011
Posts: 3,797
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Post by gemfeller on May 23, 2016 17:12:21 GMT -5
I don't think it's whalebone either. For comparison here are some agatized whalebone samples I collected downstate from you, a bit north of Pismo Beach. The cell structure is very open on the first one while the second is more solid and cuttable and its cell structure is easily seen with a bit of magnification. Happy beach collecting! Whalebone Cell Structure More Solid Whalebone
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