Rocks and Minerals Question Marathon

[quizbowl]

Smells like (Click to Show Hidden Text)

Goethite

[havendude]

Quizbowl is right.

[havendude]

Since no one else is asking,

[quizbowl]

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.

[havendude]

Correct

[quizbowl]

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?

[LoopQuantumGravity]

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

[quizbowl]

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

[LoopQuantumGravity]

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.

[fishman100]

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