There is a whole bunch of them. Some are hard to tell apart when they - like this - occur as a thin coating.
Some common examples are: Azurite, Chrysocolla & Malachite.
I also think chrysocolla.
These are examples from the San Pedro mine in NM.
Check out Minedat web. they have a bunch of photos showing the
large variety this mineral comes in.
Chrysocolia, Malachite, Goethite, Limonite all iron and copper secondary ore. They color the rock but they are actually present in a small quantity. The rock itself appears to be basaltic by composition (not to be confused with basalt). Good luck.
Copper minerals, like everyone said. The chalcopyrite will have a yellowish brown color. Sometimes it takes a chemical analysis to tell the difference between some of them.
Are you the first to find these minerals/rocks? Is there an existing mining operation near by? Do they outcrop more in you're area? Are those rocks cowered by sediments? Do you have a geological map of the area? What is the mineralization you were digging around?
Those minerals represent secondary ore enrichment. It is probably nothing significant, but it is worth checking out depending on you answers. Good luck.