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Agardite-(Ce)
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Agardite
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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Agardite-(Ce)

General Information:
 Chemical Formula:
(Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O)
 Composition:
(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 
 Empirical Formula:
Ce0.75Ca0.25Cu6(AsO4)3(OH)6·3(H2O)
 IMA Status:
Not IMA Approved (Dana # Added)
 Name Origin:
Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.
Physical Properties:
 Color:
bluish, yellow green, or sky blue.
 Density:
3.72
 Diaphaniety:
Transparent
 Hardness:
3-4 - Calcite-Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
greenish white
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