Jasper is also usually speckled with white inclusions.gneissisnice wrote:From what I understand, jasper's just a variety of chert. Basically, it's chert that isn't black (that's flint) or white. It's typically red or green.Paleofreakazoid wrote:I've been finding mixed definitions on this––what is Jasper? An opaque chalcedony? An opaque chalcedony with ferric inclusions? A chert?
And if it's debatable, what definition would you use to identify it in competition?
Rocks and Minerals B/C
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Re: Rocks and Minerals B/C
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Re: Rocks and Minerals B/C
its usually red not speckled with white inclusionSciBomb97 wrote:Jasper is also usually speckled with white inclusions.gneissisnice wrote:From what I understand, jasper's just a variety of chert. Basically, it's chert that isn't black (that's flint) or white. It's typically red or green.Paleofreakazoid wrote:I've been finding mixed definitions on this––what is Jasper? An opaque chalcedony? An opaque chalcedony with ferric inclusions? A chert?
And if it's debatable, what definition would you use to identify it in competition?
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Nationals History...
2008: Team 1st, Rocks 2nd
2009: Team 3rd, Fossils 7th
2010: Team 5th, Fossils 4th, Ornithology 7th Egg o Naut 6th
2011: Team 4th, Ornithology 3rd
2012: Team 2nd (Assistant Coach)
2013: Team 3rd (Assistant Coach)
2008: Team 1st, Rocks 2nd
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2010: Team 5th, Fossils 4th, Ornithology 7th Egg o Naut 6th
2011: Team 4th, Ornithology 3rd
2012: Team 2nd (Assistant Coach)
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Re: Rocks and Minerals B/C
Ummm...Jasper is a variety of Quartz not Chertgneissisnice wrote:From what I understand, jasper's just a variety of chert. Basically, it's chert that isn't black (that's flint) or white. It's typically red or green.Paleofreakazoid wrote:I've been finding mixed definitions on this––what is Jasper? An opaque chalcedony? An opaque chalcedony with ferric inclusions? A chert?
And if it's debatable, what definition would you use to identify it in competition?
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Re: Rocks and Minerals B/C
I'm pretty sure I've heard it for both... But to be on the safe side, I'd go with gneiss's info...
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Re: Rocks and Minerals B/C
Actually, everyone so far is wrong! Jasper is a form of Chalcedony.tuftedtitmouse12 wrote:I'm pretty sure I've heard it for both... But to be on the safe side, I'd go with gneiss's info...
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Re: Rocks and Minerals B/C
You got that from Wikipedia, didn't you? Different Wikipedia pages seem to be conflicting on this... THIS page says that jasper is a variety of chert under the "Varieties of Chert" heading while THIS page says that it's a variety of chalcedony while THIS page says that jasper, chalcedony, and chert are all just different forms of microcrystalline quartz under the "Varieties (according to microstructure)" subheading.quizbowl wrote:Actually, everyone so far is wrong! Jasper is a form of Chalcedony.tuftedtitmouse12 wrote:I'm pretty sure I've heard it for both... But to be on the safe side, I'd go with gneiss's info...
In fact, chert, chalcedony, and jasper are all just different forms of quartz. Of that I am sure.
-- -- --
"So whether you eat or drink or whatever you do, do it all for the glory of God." ~1 Corinthians 10:31~
They say that a smile can light up somebody's day
So today, smile
Shine a light in somebody's life
Be that light in the darkness
"So whether you eat or drink or whatever you do, do it all for the glory of God." ~1 Corinthians 10:31~
They say that a smile can light up somebody's day
So today, smile
Shine a light in somebody's life
Be that light in the darkness
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Re: Rocks and Minerals B/C
Not really. Chalcedony is really an amalgamation of both quartz and mogamite. While both are SiO2, mogamite is really a polymorph of quartz. Yes, it is a silica mineral, but I personally don't consider it a variety of quartz. However, the list trumps all interpretation, so while we might argue for days on end over the true chemical nature of these minerals, the list is all that counts.SciBomb97 wrote:You got that from Wikipedia, didn't you? Different Wikipedia pages seem to be conflicting on this... THIS page says that jasper is a variety of chert under the "Varieties of Chert" heading while THIS page says that it's a variety of chalcedony while THIS page says that jasper, chalcedony, and chert are all just different forms of microcrystalline quartz under the "Varieties (according to microstructure)" subheading.quizbowl wrote:Actually, everyone so far is wrong! Jasper is a form of Chalcedony.tuftedtitmouse12 wrote:I'm pretty sure I've heard it for both... But to be on the safe side, I'd go with gneiss's info...
In fact, chert, chalcedony, and jasper are all just different forms of quartz. Of that I am sure.
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Re: Rocks and Minerals B/C
Werll, accordiong to the offical list for Nats 2012. Its Quartz, and im trusting that list and that list only.
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Re: Rocks and Minerals B/C
Source:http://webmineral.com/data/Quartz.shtml
According to this, jasper is red or brown chalcedony.
Chalcedony is microcrystalline quartz. Also, other sources have said that it also contains moganite (a monoclinic silica mineral)
Chert is similar, only it is cryptocrystalline (smaller crystals).
According to this, jasper is red or brown chalcedony.
Chalcedony is microcrystalline quartz. Also, other sources have said that it also contains moganite (a monoclinic silica mineral)
Chert is similar, only it is cryptocrystalline (smaller crystals).
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Re: Rocks and Minerals B/C
Chalcedony is microcrystalline and chert/flint is cryptocrystalline. What that means that is that chalcedony has tiny crystals, while chert has crystals so small that you can't see them at all, making it look more like there aren't any.LoopQuantumGravity wrote:Source:http://webmineral.com/data/Quartz.shtml
According to this, jasper is red or brown chalcedony.
Chalcedony is microcrystalline quartz. Also, other sources have said that it also contains moganite (a monoclinic silica mineral)
Chert is similar, only it is cryptocrystalline (smaller crystals).
I always learned that jasper was red or brown chert, not chalcedony, but I suppose there's still some grey area there. Easier just to say that jasper is red micro- or cryptocrystalline quartz and call it a day.
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