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Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 10:55 am
by hexagonaria
sorry didnt see some one already answered.
not sure how to delete posts..

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 11:00 am
by pinkyfinger
Image

This is a pseudomorph.

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 11:10 am
by quizbowl
Goethite? lol idk

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 11:23 am
by pinkyfinger
Well, limonite, but yes. Goethite and limonite both form pseudomorphs of pyrite.

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 12:05 pm
by quizbowl
pinkyfinger wrote:Well, limonite, but yes. Goethite and limonite both form pseudomorphs of pyrite.
WHOA REALLY?!
=D

Speaking of pseudomorphs...
Image

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 12:34 pm
by pinkyfinger
It reminds me of a feldspar but I guess that means it definitely isn't one =P

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 1:04 pm
by hexagonaria
dolomite

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 3:10 pm
by 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.

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 4:31 pm
by hexagonaria
albite?

Re: Rocks and Minerals Question Marathon

Posted: January 1st, 2012, 5:23 pm
by pinkyfinger
Feldspar weathers into clay, so maybe kaolinite?