Rocks and Minerals Question Marathon

[starfield]

hexagonaria: For me, it was really process of elimination, it looked like an igneous rock and none of the other ones seemed to fit and rhyolite is one that always seems to look different to me, so that's the one that I picked. It is quite a strange sample though... >.>

For the question:

image (Click to Show Hidden Text)

[img]http://www.crystalsrocksandgems.com/images/APT-12.jpg[/img]

And how do you identify this? I can never seem to get it correct in practice...

[iYOA]

the image isnt showing.

[starfield]

How would I fix that? It's showing up fine on my computer...

[tornado guy]

How would I fix that? It's showing up fine on my computer...

I've learned from experience that getting a JPG/Wikimedia pic works best.

[starfield]

image (Click to Show Hidden Text)

[img]http://www.crystalsrocksandgems.com/images/APT-12.jpg[/img]

Does this picture work?

If still no one can see it, someone else can post a question

[PacificGoldenPlover]

Answer (Click to Show Hidden Text)

Bornite?

I can't tell if it has metallic luster or not.

[starfield]

Answer (Click to Show Hidden Text)

Bornite?

nope

[hexagonaria]

answer (Click to Show Hidden Text)

Chalcopyrite? I know conventional chalcopyrite looks much more like...well, pyrite, but i think it gets this kind of bornitesque look when it tarnishes.

[iYOA]

Answer (Click to Show Hidden Text)

hmm i think it looks more like Apatite

[hexagonaria]

oh im wrong..