Rocks & Minerals B/C 2017

[Magikarpmaster629]

1. ID
2. What mineral class does this specimen belong to?

[John Richardsim]

1. ID
2. What mineral class does this specimen belong to?

1. Hmmmm...

Uh, is it...barite?

2. Sulfates

[Magikarpmaster629]

Oops, should've cropped that out. Your turn.

[John Richardsim]

1. Identify.
2. This is (by definition) not a mineral. What are the main minerals that constitute it? Under what conditions does it form?
3. What are some uses for this "mineral"?
4. Where are most of the US's reserves of this "mineral" located? About how much of U.S. consumption is imported?

[Unome]

At least I can ID it (hopefully) (Click to Show Hidden Text)

1. bauxite?
3. for making aluminum

[Magikarpmaster629]

At least I can ID it (hopefully) (Click to Show Hidden Text)

1. bauxite?
3. for making aluminum

The rest (Click to Show Hidden Text)

1. Yep, bauxite
2. It is made of aluminium oxides and hydroxides; mainly gibbsite, boehmite and diaspore.
3. It is the main aluminium ore
4. Most are in Arkansas, as well as the rest of the southeast US. It is imported from mainly Guinea, Australia and Brazil.

[John Richardsim]

At least I can ID it (hopefully) (Click to Show Hidden Text)

1. bauxite?
3. for making aluminum

The rest (Click to Show Hidden Text)

1. Yep, bauxite
2. It is made of aluminium oxides and hydroxides; mainly gibbsite, boehmite and diaspore.
3. It is the main aluminium ore
4. Most are in Arkansas, as well as the rest of the southeast US. It is imported from mainly Guinea, Australia and Brazil.

Keep an eye on those second questions in 2 and 4...

[Entomology]

2. This is (by definition) not a mineral.

I'm so sorry to interrupt, but Bauxite (assuming that it was the mineral shown in the image) is listed under the category "Minerals" on the official list...? Is it a mineral or not? I have never done R&M before; I am sorry if I'm missing something.

Edit: Oops never mind, Bauxite is a group of a group of aluminum oxides.

[John Richardsim]

2. This is (by definition) not a mineral.

I'm so sorry to interrupt, but Bauxite (assuming that it was the mineral shown in the image) is listed under the category "Minerals" on the official list...? Is it a mineral or not? I have never done R&M before; I am sorry if I'm missing something.

Edit: Oops never mind, Bauxite is a group of a group of aluminum oxides.

Yeah, bauxite isn't a mineral, even though it is listed as one on the official list. Same thing goes for opal (it's amorphous->no crystal structure).

As far as the second questions for 2 and 4...

2. Most forms when a laterite soil in a wet (sub)tropical climate is leached of silica and other soluble components.
4. Over 99%

Anyone can go now.

[Magikarpmaster629]

1. ID
2. What is the name for magnetic samples of this mineral?