Rocks and Minerals Question Marathon

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Re: Rocks and Minerals Question Marathon

Post by tuftedtitmouse12 » October 30th, 2011, 6:25 pm

Hm, couldn't you tell it was related to periodite, because of it's greenish color? (I haven't started studying yet, but this is a wild guess)

oh, and probably igneous too, since it is slightly holey? (like pumice?)
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Re: Rocks and Minerals Question Marathon

Post by iYOA » October 31st, 2011, 10:05 pm

[img]http://www.gemstonebuzz.com/files/sphalerite.jpg[/img]
what is it? and what is it an ore of?
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Re: Rocks and Minerals Question Marathon

Post by Katherine » November 1st, 2011, 9:45 am

Sphalerite, Zinc

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Re: Rocks and Minerals Question Marathon

Post by XXGeneration » November 1st, 2011, 12:11 pm

Galena, lead.

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Re: Rocks and Minerals Question Marathon

Post by Katherine » November 1st, 2011, 4:10 pm

XXGeneration wrote:
Galena, lead.
I can't help but disagree, politely. Galena is usually found in cube shapes, but this specimen has no cube shapes, it looks like. Also, it's too gray-black-ish to be Galena, which is way more silver. I still think it's Sphalerite.  :)

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Re: Rocks and Minerals Question Marathon

Post by quizbowl » November 1st, 2011, 4:16 pm

Katherine wrote:
XXGeneration wrote:
Galena, lead.
I can't help but disagree, politely. Galena is usually found in cube shapes, but this specimen has no cube shapes, it looks like. Also, it's too gray-black-ish to be Galena, which is way more silver. I still think it's Sphalerite.  :)
I'm pretty sure you're correct.
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Re: Rocks and Minerals Question Marathon

Post by XXGeneration » November 1st, 2011, 4:35 pm

haha I was sort of just throwing it out there. Thanks for your opinion though :P I really appreciate it

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Re: Rocks and Minerals Question Marathon

Post by iYOA » November 2nd, 2011, 1:36 pm

Katherine is correct
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Re: Rocks and Minerals Question Marathon

Post by Katherine » November 2nd, 2011, 2:02 pm

Image
1. What type of rock is this mineral usually found in?
a) Metamorphic
b) Igneous
c) Sedimentary

2. Provide information on the following properties:
a) Group
b) Crystal System
c) Fracture
d) Hardness
e) Tenacity

3. Discuss the pros and cons of wearing this mineral (there won't necessarily be both pros AND cons) as jewelry.
If you are stuck, some of the facts from question 2 will be helpful, assuming they're correct.

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Re: Rocks and Minerals Question Marathon

Post by iYOA » November 2nd, 2011, 2:22 pm

1.C
2.
a) Sulfate
b)Orthorombic
c)Uneven
d)3-3.5
e)brittle

3. Its not really durable for jewelry? (not sure)
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