“..The nearby (to the chimney beds) Gila Bend mountains offer yet a few more locations of very different agates. Almost spherical... nodules contain a blue golden brown sagenite-agate (4), small specimen of a further finding range with blue and purple colors are among the most intense colored agates in Arizona at all (1, 2)... and another close occurrence shows particularly twisted banding (3) ..."

writes Johann Zenz in his book “Agates I”, Bode Publishing House 2005