Rocks and Minerals B/C

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Re: Rocks and Minerals B/C

Postby RE02 » December 25th, 2016, 12:37 pm

Is grade of metamorphism only for metamorphic rocks? Because I cant find anything for igneous or sedimentary.
Also, what is Bowen's Reaction Series, and is it different for every rock?

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Re: Rocks and Minerals B/C

Postby Magikarpmaster629 » December 25th, 2016, 12:58 pm

RE02 wrote:Is grade of metamorphism only for metamorphic rocks? Because I cant find anything for igneous or sedimentary.


Yep, since only metamorphic rocks have metamorphosed, there is only a grade of metamorphism for metamorphic rocks. However, metamorphic rocks do have parent rocks (e.g. slate's parent rock is shale, a sedimentary rock) which I guess you could think of as a 0th grade metamorphism; a rock that, once metamorphosed into another rock, is metamorphic.

RE02 wrote:Also, what is Bowen's Reaction Series, and is it different for every rock?

Bowen's Reaction Series is for igneous rocks- it's basically the order in which different minerals crystalise as magma rises. As the magma rises, it cools from very high temperatures; minerals with higher melting points will crystalise first and those with lower melting points crystalise last. Here's a typical chart:
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Re: Rocks and Minerals B/C

Postby Entomology » December 26th, 2016, 10:00 am

So let me get this straight, Agate/Onyx are varieties of Chalcedony, which is a variety of quartz. In addition, this means the varieties of Agate/Onyx (Ex. Banded Agate) are theoretically varieties of chalcedony. Why are Agate/Onyx varieties of chalcedony and not all the other quartzs as well? All the quartzes share chemical formula, crystal system, hardness, etc so why is Agate/Onyx specifically a variety of chalcedony only?
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Re: Rocks and Minerals B/C

Postby Unome » December 26th, 2016, 10:19 am

Entomology wrote:So let me get this straight, Agate/Onyx are varieties of Chalcedony, which is a variety of quartz. In addition, this means the varieties of Agate/Onyx (Ex. Banded Agate) are theoretically varieties of chalcedony. Why are Agate/Onyx varieties of chalcedony and not all the other quartzs as well? All the quartzes share chemical formula, crystal system, hardness, etc so why is Agate/Onyx specifically a variety of chalcedony only?

Not entirely sure, but if I remember correctly, chalcedony is defined as quartz without a visible crystal structure, so maybe because agate & onyx have no visible crystal structure, while other quartzes do?
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Re: Rocks and Minerals B/C

Postby RE02 » December 27th, 2016, 12:19 pm

I can't find info on garnet schist and mica schist as separate rocks; everywhere I look has them as one rock, but the list has them as two separate ones. Does anyone have a website or resource I could use? (:

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Re: Rocks and Minerals B/C

Postby Entomology » December 28th, 2016, 4:24 pm

RE02 wrote:I can't find info on garnet schist and mica schist as separate rocks; everywhere I look has them as one rock, but the list has them as two separate ones. Does anyone have a website or resource I could use? (:


Have you tried using Audubon, Smithsonian, field guides, etc? I used a couple of detailed geology books from my local library to study. If you still can't find them listed as separate rocks, I think it should still be fine. Aren't the two rocks very similar anyway, besides the inclusions of the different minerals?
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Re: Rocks and Minerals B/C

Postby scribbles19 » December 29th, 2016, 7:34 pm

I'm new here so sorry if I'm posting in the wrong place D: But I was wondering, in the rules, it says one of the topics under "rocks" is the "rock cycle." So, for example, if I'm studying the metamorphic rock Gneiss, what would be the "rock cycle" for that particular rock? Thanks in advance!

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Re: Rocks and Minerals B/C

Postby megan_scioly » January 6th, 2017, 6:59 am

Are there any tests for 2017 that can be found online?

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Re: Rocks and Minerals B/C

Postby Magikarpmaster629 » January 10th, 2017, 3:43 pm

scribbles19 wrote:I'm new here so sorry if I'm posting in the wrong place D: But I was wondering, in the rules, it says one of the topics under "rocks" is the "rock cycle." So, for example, if I'm studying the metamorphic rock Gneiss, what would be the "rock cycle" for that particular rock? Thanks in advance!

How does gneiss form? In order to answer that you need to figure out how metamorphic rocks in general form, and the specific case for gneiss. Do that for several rocks and you'll start to see some patterns. Good luck!

Now for my question: I'll be at an invitational in a few days held at a high school, should I expect to see real specimens or pictures?
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Re: Rocks and Minerals B/C

Postby John Richardsim » January 10th, 2017, 5:05 pm

Magikarpmaster629 wrote:Now for my question: I'll be at an invitational in a few days held at a high school, should I expect to see real specimens or pictures?

"Don't expect either; be prepared for both."

(Hopefully whichever school proctors it will have access to and use real specimens, but I wouldn't count on that being the case.)
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Re: Rocks and Minerals B/C

Postby Unome » January 10th, 2017, 5:12 pm

John Richardsim wrote:
Magikarpmaster629 wrote:Now for my question: I'll be at an invitational in a few days held at a high school, should I expect to see real specimens or pictures?

"Don't expect either; be prepared for both."

(Hopefully whichever school proctors it will have access to and use real specimens, but I wouldn't count on that being the case.)

Based on Fossils experience, I'd expect not. They may have a few, but it's unlikely (this also depends on how well-funded the school running it is)
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Re: Rocks and Minerals B/C

Postby driedmango » January 14th, 2017, 8:42 pm

Hi!! *new to forum* haha
I've been struggling w this event a lot; it's kind of sad actually. Anyone got any tips on how to get good? I feel like IDing is just super hard bc like 90% of the time everything looks the same...
(And looking at pictures on the internet/Quizlets or whatever doesn't really help me bc the same pictures show up over and over so eventually you get everything right just bc you recognize the picture.)
I feel like if I can just identify the rock/mineral then I can get most of the questions right but more than half the time I can't even ID the specimen (rip). Any ideas on how to get better at identification? :|
WE DID IT
2017/18 events
Northview | Westlake | MIT | Centerville | Solon | Regionals | States | Nats!!
Remote: - | 1 | 2 | 2 | 1 | 3 | 1 | 3 |
Rocks: 7 | - | 3 | 1 | 2 | 1 | 4 | 8 |
Thermo: 8 | 4 | 4 | - | 7 | 3 | 2 | 11 |
Team: 1 | 1 | 2 | 3 | 1 | 1 | 1 | 2 |

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Re: Rocks and Minerals B/C

Postby John Richardsim » January 14th, 2017, 9:14 pm

driedmango wrote:Hi!! *new to forum* haha
I've been struggling w this event a lot; it's kind of sad actually. Anyone got any tips on how to get good? I feel like IDing is just super hard bc like 90% of the time everything looks the same...
(And looking at pictures on the internet/Quizlets or whatever doesn't really help me bc the same pictures show up over and over so eventually you get everything right just bc you recognize the picture.)
I feel like if I can just identify the rock/mineral then I can get most of the questions right but more than half the time I can't even ID the specimen (rip). Any ideas on how to get better at identification? :|

Are you practicing with real specimens at all?
"More like, 'Belongs in the Trash!'"

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Re: Rocks and Minerals B/C

Postby driedmango » January 15th, 2017, 8:37 am

John Richardsim wrote:
driedmango wrote:Hi!! *new to forum* haha
I've been struggling w this event a lot; it's kind of sad actually. Anyone got any tips on how to get good? I feel like IDing is just super hard bc like 90% of the time everything looks the same...
(And looking at pictures on the internet/Quizlets or whatever doesn't really help me bc the same pictures show up over and over so eventually you get everything right just bc you recognize the picture.)
I feel like if I can just identify the rock/mineral then I can get most of the questions right but more than half the time I can't even ID the specimen (rip). Any ideas on how to get better at identification? :|

Are you practicing with real specimens?

yeah we have kits and stuff with real specimens but some of them don't have keys so we don't know if we're ID-ing them correctly lol.
WE DID IT
2017/18 events
Northview | Westlake | MIT | Centerville | Solon | Regionals | States | Nats!!
Remote: - | 1 | 2 | 2 | 1 | 3 | 1 | 3 |
Rocks: 7 | - | 3 | 1 | 2 | 1 | 4 | 8 |
Thermo: 8 | 4 | 4 | - | 7 | 3 | 2 | 11 |
Team: 1 | 1 | 2 | 3 | 1 | 1 | 1 | 2 |

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Re: Rocks and Minerals B/C

Postby embokim » January 15th, 2017, 1:20 pm

Anybody have tips for what to put in our binder, because i feel like its just moot, because if you can bring your book, then you already have all of the information readily available.
Thanks a lot
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