Rocks and Minerals B/C

[quizbowl]

Why is there an asterisk next to silver and diamond and gold in the list?

At the bottom of the list is a supply company that you can buy a R&M set from for practice. However, those three are not included (I mean, they're pretty expensive )

[iYOA]

Totally need to get a head start for next year. This year was...bleh. The list shouldn't change much, right?

yeah like at most 1 specimen will be different.

[quizbowl]

Totally need to get a head start for next year. This year was...bleh. The list shouldn't change much, right?

yeah like at most 1 specimen will be different.

Hrmm, I'm sure that it'll change a bit more that. Looking at the 2006 --> 2008 list had at least a dozen changes overall. Not much, but enough to give some diversity in this event. And to be honest, I really love the rule of addition of new specimens by Event Supervisors - not many events allow for this amount of wiggle room. If I get a chance, I'd definitely love to throw in some tough IDs

[havendude]

I was taking a test, and one of the samples was a huge rock. It looked like chunks of red sandstone with calcite veins about 1cm thick separated the pieces. Does anyone have any idea about what it is?

[LoopQuantumGravity]

I was taking a test, and one of the samples was a huge rock. It looked like chunks of red sandstone with calcite veins about 1cm thick separated the pieces. Does anyone have any idea about what it is?

Pegmatite, maybe. Also, I've seen chunks of gneiss that could look like that. Were the calcite veins parallel?

[SciBomb97]

I was taking a test, and one of the samples was a huge rock. It looked like chunks of red sandstone with calcite veins about 1cm thick separated the pieces. Does anyone have any idea about what it is?

Except for the red sandstone part, that sounds remotely like perthite, although that's not on the list.

[zimmy1235]

We also took the rocks and minerals test for the PA C division, and thought that was a sample of quartzite (geode?) with orthoclase and then quartz crystals inbetween.

[havendude]

Pegmatite, maybe. Also, I've seen chunks of gneiss that could look like that. Were the calcite veins parallel.

The veins were a bit willy-nilly.

[Paleofreakazoid]

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?

[gneissisnice]

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.