Agardite-(La) (original) (raw)

A valid IMA mineral species

About Agardite-(La)Hide

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Formula:

LaCu6(AsO4)3(OH)6 · 3H2O

Colour:

Grass-green to dull green, yellowish green to intense bluish green, rarely nearly colourless.

Lustre:

Sub-Vitreous, Resinous, Waxy

Name:

Named by Peter J. Modreski in 1983 for its relationship to the other agardite series minerals, and for the predominance of lanthanum as the predominant REE.

Co-Type Localities:

ⓘ Red Cloud copper mine, Gallinas Mountains, Red Cloud District, Lincoln County, New Mexico, USA
ⓘ Red Cloud Fluorite mine, Gallinas Mountains, Red Cloud District, Lincoln County, New Mexico, USA

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:50:1

12a52b4c-9ae7-41cc-b09e-f7f50c0b3fbc

IMA Classification of Agardite-(La)Hide

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IMA Formula:

LaCu2+6(AsO4)3(OH)6 · 3H2O

Type description reference:

Classification of Agardite-(La)Hide

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8.DL.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1

20.4.14

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of Agardite-(La)Hide

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Sub-Vitreous, Resinous, Waxy

Transparency:

Transparent, Translucent

Colour:

Grass-green to dull green, yellowish green to intense bluish green, rarely nearly colourless.

Density:

3.65(5) g/cm3 (Measured) 3.62(1) g/cm3 (Calculated)

Optical Data of Agardite-(La)Hide

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RI values:

_n_ω = 1.715(2) _n_ε = 1.795(2)

δ = 0.080

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of Agardite-(La)Hide

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Mindat Formula:

LaCu6(AsO4)3(OH)6 · 3H2O

Crystallography of Agardite-(La)Hide

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Class (H-M):

6/m - Dipyramidal

Cell Parameters:

a = 13.586(4) Å, c = 5.931(5) Å

Unit Cell V:

948.07 ų (Calculated from Unit Cell)

Morphology:

Crystals acicular, prismatic, to 3 mm, in tufted groups, spherical rosettes.

X-Ray Powder DiffractionHide

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Comments:

Presumably very similar to agardite-(Y).

Geological EnvironmentHide

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Geological Setting:

In small amounts in the oxidised zone of hydrothermal mineralised breccia and polymetallic mineral deposits (Red Cloud mines, New Mexico, USA).

Type Occurrence of Agardite-(La)Hide

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Co-Type Localities:

ⓘ Red Cloud copper mine, Gallinas Mountains, Red Cloud District, Lincoln County, New Mexico, USA
ⓘ Red Cloud Fluorite mine, Gallinas Mountains, Red Cloud District, Lincoln County, New Mexico, USA

Place of Conservation of Type Material:

Mineralogical State Collection "Reich der Kristalle", Munich, Germany, numbers MSM 22482, MSM 22497 (type).
National Museum of Natural History, Washington, D.C., USA, numbers 148987, 148988 (cotype).

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Synonyms of Agardite-(La)Hide

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Other Language Names for Agardite-(La)Hide

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Simplified Chinese:砷镧铜石

Traditional Chinese:砷鑭銅石

Relationship of Agardite-(La) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Agardite-(La)Hide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Agardite-(La)Hide

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References for Agardite-(La)Hide

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Reference List:

Dunn, Pete J., Fleischer, Michael, Langley, Richard H., Shigley, James E., Zilczer, Janet A. (1985) New mineral names. American Mineralogist, 70 (7-8) 871-881

Localities for Agardite-(La)Hide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.