Jump to content

Beach agate, possible bivalve?


winnph

Recommended Posts

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

IMG_20190326_145626.jpg

IMG_20190326_145646.jpg

IMG_20190326_145526.jpg

IMG_20190326_145507.jpg

Edited by winnph
  • I found this Informative 1
Link to comment
Share on other sites

I'm not seeing a fossil in this one.  I think your first instinct was correct, a nice piece of quartz.

  • I found this Informative 1
Link to comment
Share on other sites

Very pretty indeed! i'd have it. :)

But not a fossil, i'm afraid. 

Life's Good!

Tortoise Friend.

MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160-1.png.60b8b8c07f6fa194511f8b7cfb7cc190.png

Link to comment
Share on other sites

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. :)

 

5c9ac9804fb0b_Figure2.thumb.jpg.008a5d7d766657c3d0dcbc2571e00ed5.jpg

 

barnacle scars

Edited by abyssunder

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

My Library

Link to comment
Share on other sites

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 comment
Share on other sites

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

004.JPG

Link to comment
Share on other sites

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.

IMG_20190326_145642.jpg

Link to comment
Share on other sites

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.

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

Link to comment
Share on other sites

Got it! I was assuming (as is always unwise) that it would have the more "fractured" appearance of the specimens shared

Link to comment
Share on other sites

  • 2 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...