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Post by radio on Apr 29, 2015 19:21:27 GMT -5
Lousy cell phone pic, but I was too lazy to set up the light box. I found this many years ago in California and thought it was unique enough to hang on to. To my untrained eye, it appears to be a fracture that occurred during an earthquake and subsequently healed. I thought at first it was a minor misalignment, but looking closer, the various strata don't even come close to lining up as is more evident in pic 2. The specimen is about 3 inches wide, 2 1/2 tall and 1 1/4 thick and was found in a creek bed not too far from Fresno. In that same creek, I found a volleyball size chunk of brecciated jasper that is prettier than a lot of Stone Canyon material I have seen. I sure would like to go back there again  Side 1  Side 2  |
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Apr 29, 2015 20:23:47 GMT -5
Nice!!!!!!!!!!!! I like it!
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Post by radio on Apr 29, 2015 20:31:06 GMT -5
Nice!!!!!!!!!!!! I like it! Thanks! I showed it to a Geology teacher out there and he drooled a bucket full and wanted it for "His class" :-) I have no idea how rare or valuable it is, but neither I, or anyone I know in the hobby has seen one in a hand size specimen. |
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Post by Toad on Apr 29, 2015 22:38:05 GMT -5
Real cool, me likes...
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Post by stephan on Apr 30, 2015 0:14:00 GMT -5
Same concept as brecciated jasper, just not as mangled as some. Definitely jasper. Hope you picked up the "volleyball" as well.
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Post by snowmom on Apr 30, 2015 5:57:45 GMT -5
makes me think of the banded iron jaspers found here, really an ancient rock. If it could talk! Surely makes you think when you come across something like this. Thanks for showing it to us!
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Post by radio on Apr 30, 2015 7:51:34 GMT -5
Same concept as brecciated jasper, just not as mangled as some. Definitely jasper. Hope you picked up the "volleyball" as well. I found the brecciated jasper in the same creek bed, and yes, it took a ride home with me. I have cut several slabs and still have a big chunk of it left This is one of the first cuts near the end and it got much better the more I cut. I'll try to remember to dig out some slabs or the chunk and take some decent pics. I also found a gorgeous brecciated jasper piece that turned out to be a scraper complete with groove to fit the thumb. I just picked it up thinking it would make some pretty smaller cabs and didn't realize what it was until a year or so later when I looked at it again. I was turning it over in my hand looking at the pattern in the stone and it just fell in place in my hand like it was made to fit. I still remember getting goose bumps when that happened!   |
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Post by stephan on Apr 30, 2015 9:39:44 GMT -5
Same concept as brecciated jasper, just not as mangled as some. Definitely jasper. Hope you picked up the "volleyball" as well. I found the brecciated jasper in the same creek bed, and yes, it took a ride home with me. I have cut several slabs and still have a big chunk of it left This is one of the first cuts near the end and it got much better the more I cut. I'll try to remember to dig out some slabs or the chunk and take some decent pics. I also found a gorgeous brecciated jasper piece that turned out to be a scraper complete with groove to fit the thumb. I just picked it up thinking it would make some pretty smaller cabs and didn't realize what it was until a year or so later when I looked at it again. I was turning it over in my hand looking at the pattern in the stone and it just fell in place in my hand like it was made to fit. I still remember getting goose bumps when that happened! Wow! That is nice stuff. Thanks for sharing your pics. I'd love to see more of the slabs, and the scraper, too. Nice finds. I have some "Stone Canyon" jasper that looks very similar. it seems that a lot of brecciated jasper gets tagged with that location -- kinda like anything orbicular is now call "poppy" jasper, which was originally a trade name reserved only for the Morgan Hill stuff. |
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Apr 30, 2015 14:12:20 GMT -5
those are very nice, esp like the stone canyon. Curious why you think seismic vs more common fracture methods?
Thx for sharing.
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Post by snowmom on Apr 30, 2015 16:42:43 GMT -5
that brecciated jasper is gorgeous!
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Post by radio on Apr 30, 2015 21:23:21 GMT -5
those are very nice, esp like the stone canyon. Curious why you think seismic vs more common fracture methods? Thx for sharing. I'm not positive and just going on what the Geology teacher told me and I am also making the assumption given the location this material came from which is South West of Fresno near Coalinga, Ca. I think it's still the Diablo Mtn. range down there, but not 100% sure. Something caused the strata to become misaligned on either side of the vertical fracture and that whole area is prone to earthquakes of varying magnitude |
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