Higginsite is a synonym for conichalcite and is named after the less well-known Higgins Mine at Bisbee. Lustrous, apple-green conichalcite microcrystals richly cover the matrix plate on this old-time specimen. Conichalcite is a relatively uncommon copper arsenate found in the oxidized zones of copper deposits. Ex. Dennis Mullane Bisbee Collection and comes with a Warner & Grieger label. They were prominent California dealers and collectors prior to World War II. Primary production from the Higgins Mine was from 1913-1929. Old-time material.