I was hunting a different elusive material and finally found a dead end canyon where I found a couple pieces of this material. Up the canyon I found the seam on the surface running for 30 feet. Digging down (very hard) at about 4-5 feet deep the seam got 11" across and this was where there were more blues in the agate. Filled in the hole and haven't been back in a couple years, no doubt someone has found it by now. I called it Coronary from the look of the material with sun coming thru reminded me of blood vessels.