Rocks and Minerals Question Marathon

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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » September 3rd, 2011, 8:31 am

iYOA wrote:
Question 5 Answer
The pinkish mineral is feldspar and it can either be monoclinic or triclinic(but i think orthoclase feldspar is monoclinic).
EDIT: The other mineral is Biotite and it is also monoclinic. lol at first i thought it was slate


I might not have internet access for 24hrs after 12pm so if anyone is feeling impatient they may post a question in my place after my answer is verified.


I was not asking about the pinkish mineral, so I'm not sure if that's correct; however, your identification of the black mineral is correct! :D

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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 5th, 2011, 3:48 am

Here is the next question:
Question 6
Image
Image

a) Identify it.
b) Which mineral group does it belong to?
c) It is the principle ore mineral for which alkali metal?
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Re: Rocks and Minerals Question Marathon

Postby quizbowl » September 5th, 2011, 5:26 am

Answer
a) Identify it. --> Lepidolite?
b) Which mineral group does it belong to? The mica group (which makes it a phyllosilicate)
c) It is the principle ore mineral for which alkali metal? Lithium
2010: 5th in NYS
2011: 4th in NYS
2012: 3rd in NYS

<quizbowl> ey kid ya want some shortbread
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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 5th, 2011, 7:54 am

a and b are correct. however c is actually rubidium.
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Re: Rocks and Minerals Question Marathon

Postby quizbowl » September 5th, 2011, 8:26 am

iYOA wrote:a and b are correct. however c is actually rubidium.

Oh, didn't see principle XD
Image
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.

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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 5th, 2011, 8:59 am

Question 7 Answer
This is Amazonite(microcline). One big giveaway is the color, as well as the perfect cleavage and distinctive crystal pattern.


For all id, I think we should also provide reasoning as to why we made that choice so it can be more helpful to people reviewing these questions.
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Re: Rocks and Minerals Question Marathon

Postby quizbowl » September 5th, 2011, 9:00 am

iYOA wrote:
Question 7 Answer
This is Amazonite(microcline). One big giveaway is the color, as well as the perfect cleavage and distinctive crystal pattern.


For all id, I think we should also provide reasoning as to why we made that choice so it can be more helpful to people reviewing these questions.

Good job! And that's a great idea, by the way
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.

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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 5th, 2011, 9:35 am

Question 8
Image
Image
Image

a) Identify it.
b) In the last picture, what optical property is illustrated by the band of light which runs across the specimen.
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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » September 5th, 2011, 11:58 am

Question 8 Answer
a) Identify it.
Selenite [Gypsum]
What tipped me off was luster and transparency; it's like sort of glossy, but not really... dunno how to explain :P

b) In the last picture, what optical property is illustrated by the band of light which runs across the specimen.
Cat's Eye

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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 5th, 2011, 12:05 pm

a is correct, b is very close; i think the formal term for it is chatoyancy.
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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » September 5th, 2011, 12:09 pm

iYOA wrote:a is correct, b is very close; i think the formal term for it is chatoyancy.


"The term Cat's Eye, when used by itself as the name of a gemstone, can only be used to refer to a Cat's Eye Chrysoberyl. Any other stone exhibiting this phenomenon must have the stone's name after the Cat's Eye identifier, e.g., Cat's Eye Aquamarine."

This was on the wikipedia page for chatoyancy; cat's eye redirected there. Hopefully testwriters won't be that picky! :D

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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 7th, 2011, 12:54 pm

yep lol.

ur turn :P
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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » September 7th, 2011, 1:04 pm

Question 9?
Image
1. What is the mineral?
2. Name the group that this mineral belongs to.

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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » September 10th, 2011, 6:58 pm

If no one answers in the next 24 hours I will most likely give the answer in order to keep this thread from dying :3

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Re: Rocks and Minerals Question Marathon

Postby rocketman1555 » September 12th, 2011, 11:51 am

In order to keep this thread alive here is a new question.

What type of rock makes up Mammoth Caves?

What is its chemical composition?
I am a practitioner of the art of magic known as science.


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