Walker
starting to shine!
Member since July 2017
Posts: 31
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Post by Walker on Aug 2, 2017 13:49:08 GMT -5
I was wondering if these two rocks might be examples of conglomerate. Any input greatly appreciated. Thanks, Walker
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skysgt
off to a rocking start
Member since May 2017
Posts: 7
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Post by skysgt on Aug 4, 2017 18:45:03 GMT -5
Small image, but from what I can see they both look like forms of conglomerate. May be able to tell better, if the image was larger.
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Post by kk on Aug 4, 2017 19:19:43 GMT -5
Looks like ingrown feldspar in arkose and granite?
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Post by fantastic5 on Aug 11, 2017 12:08:03 GMT -5
I'm no expert, but I always thought conglomerates had rounded stones in matrix. A sediment from an old stream bed. The inclusions in these two rocks appear angular, almost crystal like. I see things like the one on the right in pegmatites around here. The black and white one is really neat and would look amazing if it would take a shine.
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ryan
starting to spend too much on rocks
Member since October 2016
Posts: 185
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Post by ryan on Aug 11, 2017 12:44:59 GMT -5
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Post by rockpickerforever on Aug 11, 2017 14:26:19 GMT -5
I agree with Anne fantastic5 . Round pebbles in matrix. This is what I think of as conglomerates:
Those all from Ocotillo Wells in the SoCal desert.
Not sure what you would call this next one. I don't think it's a breccia, as it is not composed of shattered pieces. A conglomerate made of sharp pebbles?
Much more solid, the "glue" better than the first ones. Not sure of the origin of this. Could have been self collected in the desert, or may have come from the San Diego club's silent auction at some point in time over the years.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Aug 11, 2017 21:17:03 GMT -5
Jean that last one is definitely a conglomerate. Gorgeous!
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Post by rockpickerforever on Aug 11, 2017 21:59:31 GMT -5
Thank you, Scott. Conglomerate it is! It's a purdy one.
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