winnph Posted March 26, 2019 Share Posted March 26, 2019 (edited) I found this on a rocky beach in West Seattle. Looks to be pretty transparent with a bit of banding. I assume it's just geological, but based on the size and shape I guess it could maybe be a bivalve fossil? SG is 2.61 Edited March 26, 2019 by winnph 1 Link to post Share on other sites
ClearLake Posted March 26, 2019 Share Posted March 26, 2019 I'm not seeing a fossil in this one. I think your first instinct was correct, a nice piece of quartz. 1 Link to post Share on other sites
Tidgy's Dad Posted March 26, 2019 Share Posted March 26, 2019 Very pretty indeed! i'd have it. But not a fossil, i'm afraid. Link to post Share on other sites
winnph Posted March 26, 2019 Author Share Posted March 26, 2019 Yeah I didn't think so, just thought I'd throw it out there... Thanks! Link to post Share on other sites
abyssunder Posted March 27, 2019 Share Posted March 27, 2019 (edited) The first two pictures remind me of percussion marks on the surface of a tumbled silica rich pebble. Don't forget the barnacle attachment scars as a possibility for the other strange patterns. barnacle scars Edited March 27, 2019 by abyssunder Link to post Share on other sites
winnph Posted March 27, 2019 Author Share Posted March 27, 2019 Yep, the markings are definitely percussion marks and recent barnacle remnants, the only reason I thought it could possibly be a clam cast/mold is based on the banding it is clearly an agate that filled a void in the sandstone, and it has a similar overall shape and size, kind of a flattened ovoid, but it doesn't really look THAT much like one. I'm already convinced it isn't! Link to post Share on other sites
Steve Posted March 27, 2019 Share Posted March 27, 2019 Your rock is called carnelian a type of quartz but not a true agate.I have tumble polished lots of them they are great for this and look great....,.....Steve Link to post Share on other sites
winnph Posted March 27, 2019 Author Share Posted March 27, 2019 Those look very nice! I am not positive that's what mine is, though, as there appears to be concentric banding that looks more like a typical agate. I took this photo yesterday before putting it in the tumbler this morning, you can kinda see the concentric banding centered near my top finger. I'll post a photo after the rough tumbling is done in a week or two, maybe we'll be able to see into it a little more clearly. Link to post Share on other sites
ynot Posted March 28, 2019 Share Posted March 28, 2019 3 hours ago, winnph said: ! I am not positive that's what mine is, though, as there appears to be concentric banding that looks more like a typical agate. Carnelian is a form of agate and can be "banded" like other agates. Link to post Share on other sites
winnph Posted March 28, 2019 Author Share Posted March 28, 2019 Got it! I was assuming (as is always unwise) that it would have the more "fractured" appearance of the specimens shared Link to post Share on other sites
winnph Posted April 5, 2019 Author Share Posted April 5, 2019 Just thought I'd share what it looks like after rough tumbling. Link to post Share on other sites
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