From hills in North San Diego county. Possibly epidote? I've been collecting these for years and have looked at every mineral photo online but have not found anything like it. Have also found it in black (small black crystal seen in this pic). Picture is magnified about 4X. Actual rock is 1" X 2".
I checked for magnetism (right word?) and no indication of that.
Uploaded a pic with multiple types of rocks I find - most all of them in the same area. Maybe it will help to see the green part in different configurations.
Here are more sample rocks found in same general area so you can see the other forms of the green mineral.