Rocks and Minerals B/C

Locked
User avatar
SciBomb97
Member
Member
Posts: 185
Joined: December 6th, 2011, 9:22 pm
Division: C
State: AL
Location: In your dreams
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by SciBomb97 » May 9th, 2012, 6:57 am

gneissisnice wrote:
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?
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.
Jasper is also usually speckled with white inclusions.
-- -- --
"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

User avatar
sciencegeek100
Member
Member
Posts: 307
Joined: April 6th, 2009, 7:10 am
Division: Grad
State: CA
Location: Earth
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by sciencegeek100 » May 10th, 2012, 8:00 pm

SciBomb97 wrote:
gneissisnice wrote:
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?
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.
Jasper is also usually speckled with white inclusions.
its usually red not speckled with white inclusion

I was 2nd at Nationals in 2008 :D :D :D as a freshman :o
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)

crazyfloboe
Member
Member
Posts: 36
Joined: May 8th, 2012, 2:33 pm
Division: C
State: TX
Location: *coughs* under vic's bed *coughs*
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by crazyfloboe » May 12th, 2012, 8:40 am

gneissisnice wrote:
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?
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.
Ummm...Jasper is a variety of Quartz not Chert
In the end, as we fade into the night~
O.O -.- Its too early
SANDSHREW!
^^^ Favorite pokemon <3

User avatar
tuftedtitmouse12
Member
Member
Posts: 778
Joined: January 3rd, 2011, 12:26 pm
Division: Grad
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by tuftedtitmouse12 » May 12th, 2012, 3:23 pm

I'm pretty sure I've heard it for both... But to be on the safe side, I'd go with gneiss's info...
peter, peter, peter

User avatar
quizbowl
Member
Member
Posts: 1044
Joined: April 10th, 2010, 3:48 pm
Division: Grad
State: NY
Location: Syosset High, WLI, NY --> UChicago '16
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by quizbowl » May 12th, 2012, 3:40 pm

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...
Actually, everyone so far is wrong! Jasper is a form of Chalcedony.
2010: 5th in NYS
2011: 4th in NYS
2012: 3rd in NYS
<quizbowl> ey kid ya want some shortbread
<EASTstroudsburg13> I don't know why, but I just can't bring myself to delete this post.

User avatar
SciBomb97
Member
Member
Posts: 185
Joined: December 6th, 2011, 9:22 pm
Division: C
State: AL
Location: In your dreams
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by SciBomb97 » May 12th, 2012, 4:20 pm

quizbowl wrote:
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...
Actually, everyone so far is wrong! Jasper is a form of Chalcedony.
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.
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

User avatar
quizbowl
Member
Member
Posts: 1044
Joined: April 10th, 2010, 3:48 pm
Division: Grad
State: NY
Location: Syosset High, WLI, NY --> UChicago '16
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by quizbowl » May 12th, 2012, 4:26 pm

SciBomb97 wrote:
quizbowl wrote:
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...
Actually, everyone so far is wrong! Jasper is a form of Chalcedony.
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.
In fact, chert, chalcedony, and jasper are all just different forms of quartz. Of that I am sure.
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.
2010: 5th in NYS
2011: 4th in NYS
2012: 3rd in NYS
<quizbowl> ey kid ya want some shortbread
<EASTstroudsburg13> I don't know why, but I just can't bring myself to delete this post.

crazyfloboe
Member
Member
Posts: 36
Joined: May 8th, 2012, 2:33 pm
Division: C
State: TX
Location: *coughs* under vic's bed *coughs*
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by crazyfloboe » May 12th, 2012, 6:12 pm

Werll, accordiong to the offical list for Nats 2012. Its Quartz, and im trusting that list and that list only.
In the end, as we fade into the night~
O.O -.- Its too early
SANDSHREW!
^^^ Favorite pokemon <3

User avatar
LoopQuantumGravity
Member
Member
Posts: 20
Joined: April 6th, 2012, 6:58 pm
Division: B
State: ID
Location: In a universe with quantized spacetime
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by LoopQuantumGravity » May 13th, 2012, 6:54 am

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).

User avatar
gneissisnice
Exalted Member
Exalted Member
Posts: 927
Joined: March 11th, 2008, 9:10 am
Division: Grad
State: NY
Location: Long Island
Has thanked: 0
Been thanked: 0

Re: Rocks and Minerals B/C

Post by gneissisnice » May 15th, 2012, 4:16 am

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).
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.

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.
2009 events:
Fossils: 1st @ reg. 3rd @ states (stupid dinosaurs...) 5th @ nats.
Dynamic: 1st @ reg. 19thish @ states, 18th @ nats
Herpetology (NOT the study of herpes): NA
Enviro Chem: 39th @ states =(
Cell Bio: 9th @ reg. 18th @ nats
Remote: 6th @ states 3rd @ Nats
Ecology: 5th @ Nats

Locked

Return to “2012 Study Events”

Who is online

Users browsing this forum: No registered users and 0 guests