Search found 32 matches

by eox
January 23rd, 2013, 6:19 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

Answer|The top one is a barite rose and the bottom one is a gypsum rose. I could tell by the much more defined and sharp edges on the gypsum rose, though a giveaway sign is weight because barite has a much higher specific gravity than gypsum. These rose crystals form when sand is trapped inside the...
by eox
January 22nd, 2013, 1:57 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

it varies by the rules, but streak plates are usually allowed.
ID both and tell how you could differentiate. also describe the formation.
[img]http://tinyurl.com/akecyxz[/img]
[img]http://tinyurl.com/aaun2ez[/img]
by eox
January 20th, 2013, 10:55 pm
Forum: 2013 Study Events
Topic: Rocks & Minerals B/C
Replies: 116
Views: 21054

Re: Rocks & Minerals B/C

For you JuiceBagel, I may be new to the event, but actually color can be useful...generally I just have been practicing with my partner, and surprisingly I feel like just the general shape, weight, and color gives a hint right away. But yeah, I guess others who have more practice may know better. O...
by eox
January 20th, 2013, 9:48 am
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

streak would be the way to go for me, if there wasn't any color.
should i post the next question?
by eox
January 19th, 2013, 10:31 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

hmmm|the one on the right looks like goethite, and the one on the left looks like hematite i feel like as if the one of the right has more yellow, black hues, which is usually goethite, while the one on the right has more red hues, which is a sign of hematite. i know, its kind of abstract, but some...
by eox
January 10th, 2013, 8:46 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

Pyrite. forms when hydrogen sulfide combines with iron. used in the manufacture of sulfuric acid, the most produced chemical in the world ^_^
by eox
December 25th, 2012, 7:25 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

Merry Christmas everyone! I'm pretty sure it's|Hematite, just because that's the only mineral that I know that form globules like that My opinion|I second this guess. Hematite is also called "kidney ore" due to forming shapes like the ones shown in the picture. and it has the black-red color of hem...
by eox
December 18th, 2012, 9:46 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

lepidolite on milky quartz?  :?
by eox
December 18th, 2012, 3:52 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

+2 on the lepidolite
the color was an instant giveaway
by eox
December 13th, 2012, 7:48 pm
Forum: 2013 Study Events
Topic: Rocks and Minerals Question Marathon
Replies: 690
Views: 60267

Re: Rocks and Minerals Question Marathon

[img]http://img535.imageshack.us/img535/7081/snowflakeobsidian.jpg[/img]

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