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Mineralpedia Details for Agardite-(La)

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Agardite-(La)

Agardite-(La)

Named as an analogue of agardite-Y which in turn was named in honor of Jules Agard, a geologist with the Bureau de Recherches Geologiques et Minieres in Orleans, France, and for the dominance of lanthanum over the other rare earth elements. Agardite-La is a rare mineral that can be found in small amounts in oxidized hydrothermal polymetallic mineral deposits in localities in the United States, Greece, England, Germany, and Italy, among only a few others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/agardite-(La).pdf

Formula
Cu2+6La(AsO4)3(OH)6ยท3H2
Crystal System
Hexagonal 
Crystal Habit
Acicular 
Luster
Vitreous (Glassy) 
Color
colorless, yellowish green, blue 
Streak
greenish white 
Class
Hexagonal - Dipyramidal 
Hardness
3-4 
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Agardite - (La) from Hilarion mine, Laurium dist., Attika, Greece

Agardite - (La)
            from Hilarion mine, Laurium dist., Attika, Greece

Greenish blue radial sprays of fine acicular crystals to 0.75mm.

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