Minerals identify

Know how to recognize them


Arsenate mineral

Agardite is a mineral group consisting of agardite-(Y), and agardite-(La). They comprise a group of minerals that are hydrous hydrated arsenates of rare-earth elements, with the general chemical formula (REE,Ca)Cu6(AsO4)3(OH)6·3H2O. Yttrium , neodymium , as well as trace to minor amounts of other REEs, are present in their structure. Agardite-(Y) is probably the most often found representative.[citation needed They form needle-like yellow-green (variably hued) crystals in the hexagonal crystal system structure group, which has the general chemical formula Cu2+6A(TO4)3(OH)6·3H2O, where A is a REE, Al, Ca, Pb, or Bi, and T is P or As. In addition to the four agardite minerals, the other members of the mixite mineral group are calciopetersite goudeyite plumboagardite and zálesíite

Agardite-(Y) from the Bou Skour mine in Djebel Sarhro, Morocco was the first of the agardite-group minerals to be characterized. It was described by Dietrich in 1969 and was named after Jules Agard at the Bureau de Recherches Géologiques et Minières, Orléans, France. Agardite-group minerals have subsequently been found in Germany Czech Republic Japan Spain


Color of mineral


Mohs scale ( mineral hardness )


The streak


Density ( specific gravity )


Luster ( interacts light )


Crystal ( diaphaneity )