page_title: Agardite
hierarchical_section_title: Agardite
caption_attribution_description: English: Agardite-(Ce) Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Size: 2.6 x 1.6 x 0.6 cm. A rich example of Agardite-(Ce) in the form of pistachio-green acicular crystals on contrasting matrix. Ex. Willy Israel Collection. Deutsch: Agardit-(Ce) Fundort: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region, Namibia (Fundort bei mindat.org) Größe: 2.6 x 1.6 x 0.6 cm.
context_page_description: Agardite is a mineral group consisting of agardite-, agardite-, agardite-, and agardite-. They comprise a group of minerals that are hydrous hydrated arsenates of rare-earth elements and copper, with the general chemical formula Cu₆(AsO₄)₃(OH)₆·3H₂O. Yttrium, cerium, neodymium, lanthanum, as well as trace to minor amounts of other REEs, are present in their structure. Agardite- is probably the most often found representative. They form needle-like yellow-green crystals in the hexagonal crystal system. Agardite minerals are a member of the mixite 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, mixite, petersite-, petersite-, plumboagardite, and zálesíite.
  Agardite- 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, a French geologist at the Bureau de Recherches Géologiques et Minières, Orléans, France.
context_section_description: Agardite is a mineral group consisting of agardite-(Y), agardite-(Ce), agardite-(Nd), and agardite-(La).  They comprise a group of minerals that are hydrous hydrated arsenates of rare-earth elements (REE) and copper, with the general chemical formula (REE,Ca)Cu₆(AsO₄)₃(OH)₆·3H₂O. Yttrium, cerium, neodymium, lanthanum, as well as trace to minor amounts of other REEs, are present in their structure. Agardite-(Y) is probably the most often found representative. They form needle-like yellow-green (variably hued) crystals in the hexagonal crystal system. Agardite minerals are a member of the mixite 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, mixite,  petersite-(Ce), petersite-(Y), 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, a French geologist at the Bureau de Recherches Géologiques et Minières, Orléans, France.  Agardite-group minerals have subsequently been found in Germany, Czech Republic, Greece, Italy, Japan, Namibia, Poland, Spain, Switzerland, the United Kingdom, and the United States.
caption: An example of agardite-(Ce) in the form of pistachio-green acicular crystals on contrasting matrix
exif: {}