Rocks and Minerals Question Marathon

[hexagonaria]

sorry didnt see some one already answered.
not sure how to delete posts..

[pinkyfinger]

This is a pseudomorph.

[quizbowl]

99% chance of incorrectness (Click to Show Hidden Text)

Goethite? lol idk

[pinkyfinger]

Well, limonite, but yes. Goethite and limonite both form pseudomorphs of pyrite.

[quizbowl]

Well, limonite, but yes. Goethite and limonite both form pseudomorphs of pyrite.

WHOA REALLY?!
=D

Speaking of pseudomorphs...

[pinkyfinger]

It reminds me of a feldspar but I guess that means it definitely isn't one =P

[hexagonaria]

i dont know (Click to Show Hidden Text)

dolomite

[quizbowl]

Nope! This is a really hard pseudomorph; I couldn't have figured this one out if I tried.
And yes, it does look almost identical to feldspar - nice eye! Before finding out what it was, that was my guess.

[hexagonaria]

I just now figured out what a pseudomorph is.. (Click to Show Hidden Text)

albite?

[pinkyfinger]

Probably wrong (Click to Show Hidden Text)

Feldspar weathers into clay, so maybe kaolinite?