is it kimberlite ? What are the types of kimberlite, thank you .
is it kimberlite?
- Thread starter nass
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Jim in Idaho
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- Jul 21, 2012
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Interesting rock. Where was it found? It looks similar to k, but I'd like to have seen more green in it. Maybe some olivine crystals, etc. Nice find. http://diamondprospector.freeforums.net/attachment/download/116
Jim
Jim
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Rockhunter1620
Full Member
Hello NASS, gonna try to help you out here but as Jim said without more details about the environment an circumstances of where you found them, this will be just a guess from photos.
First it looks like you have 2 different rocks there. One w/jagged edges broke from a larger mass (pic2&3), and the other a rounded, water-worn stone found near a river, crick, or stream, (pic 1&4).
And both look like they come from the same source. Here's what I see or Don't see, (oh, and you do have relatively decent close-up pics w/good light, that helps). I don't see any serpentinized olivine or peridot.
No ortho or clino-pyroxene at all, no perovskite or rutile or chromite, no pyrope garnet, none of the known minerals that make up kimberlite. What I do see is a probable polygenetic conglomerate (sedimentary)
composed of both large and small, coarse and smooth clasts, un-stratified, cemented with a variety iron oxide, quartz, and maybe some calcite mineral grains, all put together or formed in a high-energy environment. And formed relatively quickly such as an ancient landslide. This is just a guess from yer photos without the info Jim mentioned, ifn this helps.
First it looks like you have 2 different rocks there. One w/jagged edges broke from a larger mass (pic2&3), and the other a rounded, water-worn stone found near a river, crick, or stream, (pic 1&4).
And both look like they come from the same source. Here's what I see or Don't see, (oh, and you do have relatively decent close-up pics w/good light, that helps). I don't see any serpentinized olivine or peridot.
No ortho or clino-pyroxene at all, no perovskite or rutile or chromite, no pyrope garnet, none of the known minerals that make up kimberlite. What I do see is a probable polygenetic conglomerate (sedimentary)
composed of both large and small, coarse and smooth clasts, un-stratified, cemented with a variety iron oxide, quartz, and maybe some calcite mineral grains, all put together or formed in a high-energy environment. And formed relatively quickly such as an ancient landslide. This is just a guess from yer photos without the info Jim mentioned, ifn this helps.
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Rockhunter1620
Full Member
Yer welcome there NASS, but I'm still wunderin where abouts in the US you picked them rocks up at, that is what state? Are you exploring an area known for it's ancient extinct volcanos or exposed plutonic rock formations. Just curious to what led you to think you might have found a little kimberlite.
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