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Posted: **January 16th, 2012, 1:38 pm**

quizbowl wrote:
Erm... (Click to Show Hidden Text)
Hornblende?

Yeah.....

Posted: **January 16th, 2012, 1:53 pm**

Posted: **January 16th, 2012, 2:10 pm**

Answer (Click to Show Hidden Text)

Barite?

Posted: **January 16th, 2012, 2:15 pm**

Answer (Click to Show Hidden Text)

Gypsum, right?

Posted: **January 16th, 2012, 2:23 pm**

Infinity Flat wrote:
Answer (Click to Show Hidden Text)
Gypsum, right?

Right-o! It's the Desert Rose variety, if you were wondering.

Posted: **January 16th, 2012, 2:57 pm**

quizbowl wrote:
Infinity Flat wrote:
Answer (Click to Show Hidden Text)
Gypsum, right?
Right-o! It's the Desert Rose variety, if you were wondering.

Yes, I have a few good samples myself. For those wondering, barite roses tend to have much softer edges than gypsum.

Identify one of the minerals present (Click to Show Hidden Text)

[img]http://i.imgur.com/wMBEr.jpg[/img]

Posted: **January 16th, 2012, 3:03 pm**

Is it agate?

Posted: **January 16th, 2012, 3:07 pm**

hexagonaria wrote:Is it agate?

No, but it is a mineral.

EDIT: Actually, I checked, and it's not a single mineral. I updated the question to reflect this.

Posted: **January 16th, 2012, 4:57 pm**

Chalcedony?

I'd have to have an actual sample in front of me to say anything about the yellow-ish mineral.

Posted: **January 16th, 2012, 5:06 pm**

I think I saw a question earlier in the marathon like this. they said it was hematite, but it was an uncommon form

Rocks and Minerals Question Marathon