”... A great speciality of Camp Verde agate findings are the pseudomorphs of chalcedony / agate after aragonite. Occasionally the bright yellow aragonite crystals ( up to 5 cm in size ) are grown in sheaf - shape in cavities and were completely converted to bluish chalcedony. So they reveal their beauty not only in splitting the specimen , but also in the state of nature as " crystal group "...”

wrotes Johann Zenz in his book ”agates I” 2005, Bode publishing house