Scioly.org

Posted: **December 9th, 2012, 4:25 pm**

correct

Posted: **December 10th, 2012, 7:44 pm**

Identify. What type of rock is this? (Ex. Detrital Sedimentary) (Click to Show Hidden Text)

[img]http://www.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousTextures/4PorphyriticFinez/AndesiteHblPorph.jpg[/img]

Posted: **December 10th, 2012, 8:58 pm**

Possibly... (Click to Show Hidden Text)

Andesite...extrusive porphyry?

Posted: **December 10th, 2012, 9:00 pm**

Porphyritic andesite?

Posted: **December 12th, 2012, 6:54 pm**

correct!

Posted: **December 12th, 2012, 9:02 pm**

is it alright if i go?

List one known fact about this specimen (Click to Show Hidden Text)

[img]http://3.bp.blogspot.com/_IVIqCqlL2a0/TR7m0VMpnxI/AAAAAAAAAGM/xfXDVyN_IVg/s1600/26.jpg[/img]

Posted: **December 12th, 2012, 10:31 pm**

Possibly... (Click to Show Hidden Text)

i do believe that thats opal.
the best specimens are found in australia.

Posted: **December 13th, 2012, 3:01 pm**

Just to cover the other possibility (Click to Show Hidden Text)

Azurite? Used to be worth more than gold due to its value in paint making

Posted: **December 13th, 2012, 3:02 pm**

correct...i was going to say it isn't considered a mineral by many

Posted: **December 13th, 2012, 3:46 pm**

Wait eox was correct right?

Rocks and Minerals Question Marathon