A rock to ponder
I found this in the Salt River
It was buried. That pale green face was showing
Interesting. So I dug it out with my trusty crow
The I hit with me hammer. Just a few whacks
and it cracked clean and flat faced
That surface green is throughout the whole rock
It good size rock
Not very dense
The rind on the rock is a smooth basalt gray.
If I kept breaking or slabbing the rock
The green mineral would stay consistent
No reaction to acid
Although that mineral (whatever it is)
isn’t the main constituent of the rock
It only seems to be a surface phenomena
as you can see in the picture
on the edge of the break
the gray is predominant
Anyway I really interested how this rock forms?
Ingenuous or sedimentary? Or a combination ?
And what the green mineral may be?
Any ideas suggestions ideas thoughts ?
Tanks \Ed