Abstract
Agardite is a member of the mixite group minerals. It comprise a group of minerals that are hydrous hydrated arsenates of REE and copper, which contain variable amounts of calcium and sometimes lead.Agardite from the Teshima form needle-like apple-green (variably hued) crystals.As a result of their analysis, it contains a lot of Y and Dy, and Dy especially has remarkably high value (4wt%). It is estimated to Dy rich agardite-(Y).