This is relating to my previous question (http://answers.minerals.net/7749/update-previous-question-rinsed-more-colorful-rocks-shown), I am uploading closer pictures while grouping ones I assume are the same type of rock. This one intrigues me because of the multiple layers of black and green. I Googled it and still couldn't find anything close.
For the record, in the last two collage images: as written the left column was taken when the rock was dry and the right column is the rock wet. I want to add that the top row had the flash on and the bottom row did not.