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Agardite-(La)

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Agardite
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. Yttriumceriumneodymiumlanthanum 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.

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Mineralogy Database Dictionary

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Agardite-(La)

General Information:
 Chemical Formula:
(La,Ca)Cu6(AsO4)3(OH)6·3(H2O)
 Composition:
(Molecular Weight = 1,068.32 gm)
Calcium 0.94 % Ca
Lanthanum 9.75 % La
Copper 35.69 % Cu
Arsenic 21.04 % As
Hydrogen 1.13 % 
Oxygen 31.45 % 
 Empirical Formula:
La0.75Ca0.25Cu6(AsO4)3(OH)6·3(H2O)
 IMA Status:
Approved IMA (Dana # Added)
 Locality:
TL: USA, NM, Lincoln Co, Red Cloud mn
 Name Origin:
Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.
Physical Properties:
 Color:
colorless, yellowish green, or blue.
 Density:
3.72
 Diaphaniety:
Transparent
 Habits:
Acicular - Occurs as needle-like crystals., ,
 Hardness:
3-4 - Calcite-Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
greenish white
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