This one will be a little harder, so I will give THREE pictures instead of one.
First, the area:
Next, the detail I'm after:
And third, another example of the same phenomenon from the same region:
It is possible that you will have to guess at what this is to be able to search for documentation, so I will give a hint right at the start: These veins are NOT volcanic.
As always, the first person to post the position and whatever is interesting about the geology/hydrology/geowhatever in this location, wins the privilege of hosting the next WoGE.
Previous WoGEs are collected by Felix on his blog and a KML file.