Thread: Need help identifying rocks...

(Sorry about the poor photo quality)
IMG_7422.jpgIMG_2992.jpg

Any ideas?

Basalt + Opale... I think we need bigger/better pictures...
Basalt

Opal

I disagree with the identification of the first specimen as basalt. It looks much more like an or specimen from Butte Montana or one of the Copper areas in Colorado. I see pyrite and possible covellite/enargite/bornite in it.

The second pair look like common opals to me too.

If it helps, the rocks were found in Mexico. Not sure what area though.

Ah, i had no idea you could click on the images for a larger view..

With that in mind, i agree in seeing some fools gold on it, probably sulfur/iron deposits. Most definitely volcanic in origin.


Above is bornite.. A copper, ferrous sulfide (ish) rock..

With that i agree with Paleoichneum (what does that mean anyway)

Originally Posted by Zwolver

Ah, i had no idea you could click on the images for a larger view..

With that in mind, i agree in seeing some fools gold on it, probably sulfur/iron deposits. Most definitely volcanic in origin.


Above is bornite.. A copper, ferrous sulfide (ish) rock..

With that i agree with Paleoichneum (what does that mean anyway)

pyrit, much mor common than bornit would be chalkopyrit the yellow/golden parts of the stone are probably are mix out of more than those 3 minerals but I would guess that most parts are pyrit+chalkopyrit

the host rock seems to me something intermediate to mafic, probably something out of a copperporphyry? would fit to the west of the mexican coast

First one is some sort of common sulphide - probably pyrite or chalcopyrite - hosted in an intermediate to mafic mass, while the second looks like chert.