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Agardite is a mineral group consisting of agardite-(Ce), agardite-(Nd), agardite-(La), and agardite-(Y). They comprise a group of minerals that are hydrous hydrated arsenates of rare earth elements and copper, which contain variable amounts of calcium and sometimes lead. Yttrium, cerium, neodymium, lanthanum as well as trace to minor amounts of other rare earth elements are present in their structure. Agardite-(Y) is probably the most often found representative. The general formula for the group is (REE,Ca)Cu6(AsO4)3(OH)6·3H2O. They form needle-like yellow-green (variably hued) crystals in the hexagonal crystal system.
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(Molecular Weight = 1,069.23 gm)
Calcium 0.94 % Ca
Cerium 9.83 % Ce
Copper 35.66 % Cu
Arsenic 21.02 % As
Hydrogen 1.13 % H
Oxygen 31.42 % O
Not IMA Approved (Dana # Added)
Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.
bluish, yellow green, or sky blue.
3-4 - Calcite-Fluorite
| Agardite-(Ce) in Italian | Agardite-(Ce) in Polish | Agardite-(Ce) in Hungarian | Agardite-(Ce) in Latvian
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