Rocks and Minerals Question Marathon

[starfield]

Answer (Click to Show Hidden Text)

hmm i think it looks more like Apatite

That is correct! Now...how did you know? I can never identify this when it's not in its usual green, hexagonal form...

[iYOA]

ive actually seen quite a few blue samples of apatite and other blue minerals didnt seem to fit as well with that specific shade and luster.

Next Question (Click to Show Hidden Text)

[img]http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Common%20rocks/Arkose.jpg[/img]

[hexagonaria]

finally one i know.. (Click to Show Hidden Text)

arkose

[silvertongue]

Answer (Click to Show Hidden Text)

I think its granite

[quizbowl]

I was looking through my notes and it looks like Hexagonaria is right.

[hexagonaria]

Next Question (Click to Show Hidden Text)

[img]http://images.yourdictionary.com/images/definitions/lg/aragonite.jpg[/img]

1.  What is this mineral's chemical formual?
2.  Name another mineral with the same chemical formula.

[starfield]

answer (Click to Show Hidden Text)

aragonite, formula: CaCO3, other mineral: Calcite

[hexagonaria]

answer (Click to Show Hidden Text)

aragonite, formula: CaCO3, other mineral: Calcite

nicely done.

[starfield]

question (Click to Show Hidden Text)

Identify the minerals and its crystal structure[img]http://skywalker.cochise.edu/wellerr/mineral/epidote/6epidote-brazil-belkis2714.jpg[/img]

[Wadhk]

Answer (Click to Show Hidden Text)

Epidote? Monoclinic.