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Post by mohs on Apr 28, 2009 15:41:46 GMT -5
I found this yesterday going thru river rocks I find it interesting with all the different inclusions Oranges, reds, quartz, some mossy or granite... I assume it was sedimentary roller that picked up other materials & binding them
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 28, 2009 15:44:17 GMT -5
I always pick those up when Im hounding.........generally I cant do anything with them but they are still interesting.
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Post by NatureNut on Apr 28, 2009 15:46:38 GMT -5
That is very cool. Looks like a prize garden rock to me.
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Post by mohs on Apr 28, 2009 15:49:23 GMT -5
I always wondered if a gem could be inside a placer gem that got caught up in the roll kind of like an oyster someday...
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Post by 150FromFundy on Apr 28, 2009 21:19:02 GMT -5
Prize garden rock, that will make a prize slab! If it looks that good outside, it's screaming to show off its inner beauty.
You have a piece of sedimentary rock - conglomerate. weeshan is probably correct that the matrix (the cement) is soft. But the pebbles that form it are gems on their own. I see banded rhyolite, granular rhyolite, agatized jasper, and thats just the top side.
I new at this, but is seams to me that you should be able to polish slabs on a flat lap. I've seen similar rock used to make beautiful flooring in federal buildings, so it can be polished somehow. Nice find!
150FromFundy
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Post by Hard Rock Cafe on Apr 28, 2009 21:50:37 GMT -5
I love conglomerates! That's got some really nice pieces in it.
Chuck
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Post by Woodyrock on Apr 29, 2009 15:23:14 GMT -5
Looks like a pudding stone, and some of those do take a nice polish. Great for book ends, and clock faces. Woody
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Post by NatureNut on Apr 29, 2009 19:07:28 GMT -5
That baby would get swiped by Mel's wife for her garden in two seconds! ;D
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Post by mohs on Apr 29, 2009 23:58:10 GMT -5
Conglomerate. Great word! Accurate definition. I didn’t realize that these type of rocks were somewhat common. My original thought was that it rolled and collected these disparate minerals. What the original binding agent is and what the original seed was will probably always remain a mystery. But then I was thinking maybe the rolling theory is wrong. Maybe it was made under pressure? It certainly seems like whole distinct rocks though-out are bonded together. But wouldn’t it be wild if those shapes formed or grew from some metamorphic activity. Science! I like all the ideas. Especially bookends. My idea is too slice it open lengthwise. I’ll wait until I get a really nice saw setup. I like the garden rock idea, also. O well,, I could slice it, and if it not good inside for flat polishing, I could always epoxy it back together. Or have 2 pieces. Its pretty good size rock. 10 inches at least and 7 mohs round wise Anyway thanks for the comment everyone. It makes me feel good that I found something worthy of comments wow I just looked up pudding stone woody ! en.wikipedia.org/wiki/Puddingstone_(rock)cool
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Post by Hard Rock Cafe on Apr 30, 2009 12:28:41 GMT -5
Now follow the link from puddingstone to conglomerate, and you'll see that they are sedimentary.
I almost called it a puddingstone, but wasn't sure if that was reserved for particular types of conglomerates. That's what my uncle would have called it, though.
Chuck
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Post by mohs on May 2, 2009 10:31:55 GMT -5
I'm a conglomerate magnet! all i need now is a garden!
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88pathoffroad
spending too much on rocks
Oregon ROCKS!
Member since August 2008
Posts: 305
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Post by 88pathoffroad on May 4, 2009 18:43:26 GMT -5
IIRC the usual binder in conglomerate rock is either calcium or silicon with sand. Both make for some tough concrete between the pebbles!
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