SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

The Mines and Minerals of Lavrion - Agardite-(Nd)

Last Updated: 23rd Oct 2019

By Branko Rieck

AGARDITE-(Nd), CeCu6(AsO4)3(OH)6 · 3H2O, hexagonal



Please also note the general remarks here!

The type locality of this member of the agardite subgroup is a connecting tunnel between the 2nd and 3rd levels of the Hilarion area. The composition of the type material is [(Nd0.19La0.14Y0.12Pr0.05Gd0.02Ce0.02Sm0.02Dy0.02)Ca0.39]Σ0.97(Cu5.49Zn0.44)Σ5.93(AsO4)3(OH)5.38·2.64H2O (Pekov et al., 2011). The agardite-(Nd) crystals often have a core of zálesíite with peripheral parts of agardite-(Nd) and agardite-(La).


Fig. 1: The type locality of agardite-(Nd). For scale see the gloves in the foreground.


General Appearance
Crystals of Agardite-(Nd) appear as thin hexagonal crystals that are usually found in radial sprays, but occasionally also randomly scattered on the matrix or even filling vugs completely. Their color ranges from white to “blue-green”. Color is not a distinguishing feature of agardite-(Nd)! It can easily be confused with goudeyite and zálesíite. Plumboagardite due to its scarcity and mixite as well as agardite-(Y) due to their characteristic paragenesis are less prone to be confused with agardite-(Nd).

Paragenesis
Agardite-(Nd) is quite often the only mineral in vugs in the gossan matrix. If not, Cu-bearing adamite is the most common mineral to accompany it, followed by conichalcite. Malachite and azurite are often seen in the vicinity, too. Quite a bit rarer are associations with other copper-bearing minerals like parnauite, brochantite, rosasite, and cornwallite.

Localities
Apart from finds at the Kamariza Dump, agardite-(Nd) occurs most prominently at the Hilarion and Christiana mines. The most productive places in the Hilarion area are concentrated at the 2nd and 3rd levels, while in the Christiana area the 1st, 2nd, and 3rd levels yield great specimen.


Fig. 2: Agardite-(Nd) from the type locality.


Fig. 3: Agardite-(Nd) from the type locality.


Fig. 4: On a base of tiny agardite-(La) later and somewhat bigger crystal sprays of agardite-(Nd) are grown. Both have nearly identical color. The big green crystals are copper-bearing adamite.


Fig. 5: Blue-green sprays of agardite-(Nd) and agardite-(La) from the type locality of agardite-(Nd). EMPA shows zoning from a core of agardite-(La) to a rim of agardite-(Nd). The big green crystals are copper-bearing adamite.




Reference
Pekov, I.V., Chukanov, N.V., Zadov, A.E., Voudouris, P., Magganas, A., Katerinopoulos, A. (2011) Agardite-(Nd), CeCu6(AsO4)3(OH)6 · 3H2O from the Hilarion Mine, Lavrion, Greece: mineral description and chemical relations with other members of the agardite-zálesíite solid-solution system. Journal of Geosciences: 56: 249-255.

Acknowledgements
Thanks go to Dr. Uwe Kolitsch for constructive comments and diligent proofreading to improve this article.




Article has been viewed at least 393 times.
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 19, 2019 10:21:16
Go to top of page