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Posted: **May 10th, 2012, 9:16 am**

Smells like (Click to Show Hidden Text)

Goethite

Posted: **May 10th, 2012, 10:32 am**

Quizbowl is right.

Posted: **May 10th, 2012, 10:44 am**

Since no one else is asking,

Posted: **May 10th, 2012, 12:16 pm**

havendude wrote:Since no one else is asking

Chances are that I wouldn't have posted the next image an hour later, especially during AP week. Relax. (Click to Show Hidden Text)

This is breccia. I'll post a new picture before nightfall.

Posted: **May 10th, 2012, 1:32 pm**

Correct

Posted: **May 10th, 2012, 8:17 pm**

There, there - see, patience is a virtue! (Click to Show Hidden Text)

[img]http://i.imgur.com/JHTtu.jpg[/img]
A is the pink specimen, B is the clear-ish specimen
1. What is the chemical formula for specimen A? How about B?
2. What is the term for the crystal habit of A?
3. What accounts for the pink color of specimen A?
4. What is the term when specimen A is formed in areas of deep-sea sediments, where organic matter content is high?

Posted: **May 12th, 2012, 11:21 am**

quizbowl wrote:
There, there - see, patience is a virtue! (Click to Show Hidden Text)
[img]http://i.imgur.com/JHTtu.jpg[/img]
A is the pink specimen, B is the clear-ish specimen
1. What is the chemical formula for specimen A? How about B?
2. What is the term for the crystal habit of A?
3. What accounts for the pink color of specimen A?
4. What is the term when specimen A is formed in areas of deep-sea sediments, where organic matter content is high?

I think I've got it... (Click to Show Hidden Text)

A: dolomite, B: My best guess is topaz
1. A: CaMg(CO3)2, B: Al2SiO4(F,OH)2
2. Trigonal
3. Magnesium
4. Organogenic

Posted: **May 12th, 2012, 11:35 am**

LoopQuantumGravity wrote:
quizbowl wrote:
There, there - see, patience is a virtue! (Click to Show Hidden Text)
[img]http://i.imgur.com/JHTtu.jpg[/img]
A is the pink specimen, B is the clear-ish specimen
1. What is the chemical formula for specimen A? How about B?
2. What is the term for the crystal habit of A?
3. What accounts for the pink color of specimen A?
4. What is the term when specimen A is formed in areas of deep-sea sediments, where organic matter content is high?
I think I've got it... (Click to Show Hidden Text)
A: dolomite, B: My best guess is topaz
1. A: CaMg(CO3)2, B: Al2SiO4(F,OH)2
2. Trigonal
3. Magnesium
4. Organogenic

Incorrect: 1B, 2, 3

Posted: **May 13th, 2012, 6:39 am**

quizbowl wrote:
LoopQuantumGravity wrote:
quizbowl wrote:
There, there - see, patience is a virtue! (Click to Show Hidden Text)
[img]http://i.imgur.com/JHTtu.jpg[/img]
A is the pink specimen, B is the clear-ish specimen
1. What is the chemical formula for specimen A? How about B?
2. What is the term for the crystal habit of A?
3. What accounts for the pink color of specimen A?
4. What is the term when specimen A is formed in areas of deep-sea sediments, where organic matter content is high?
I think I've got it... (Click to Show Hidden Text)
A: dolomite, B: My best guess is topaz
1. A: CaMg(CO3)2, B: Al2SiO4(F,OH)2
2. Trigonal
3. Magnesium
4. Organogenic
Incorrect: 1B, 2, 3

On 2, everything I've looked at says that the crystal habit of dolomite is trigonal (specifically rhombohedral). If that's what you were looking for, please note that all rhombohedral systems are classified as trigonal.

Posted: **May 13th, 2012, 8:04 am**

Let me see if I have this right (Click to Show Hidden Text)

1A) CaMg(CO3)2 
1B) CaCO3
2) Druse
3) High manganese content
4) Organogenic

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