|Copper Petrified Wood. |
The tag that came with sample reads as follows:
Petrified wood from the Nacimiento MineBut it's the copper we're interested in here! The green color indicates that copper is a major constituent of whichever minerals make up this sample. In fact, I traded this sample for a few of my strange copper nodules.
Replacement minerals could include Malachite, Chalcocite, Azurite, Cuprite, Covellite, Digenite, Bornite, Plancheite, Iron Oxide, Pseudomalachite, Pyrite, Cubanite, Brochanite, Antlerite, Elemental Copper, Stromeyerite.
Source: Calvin Webb
Contributor: Calvin Webb
Acquired: 1 September, 2003