Allanite-(Nd) (original) (raw)

A valid IMA mineral species

About Allanite-(Nd)Hide

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Formula:

(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)

Colour:

Dark brown to black

Crystal System:

Monoclinic

Name:

Named in 2012 by Radek Škoda, Jan Cempírek, Jan Filip, Milan Novák, František Veselovský and Radim Čtvrtlík for being neodymium-dominant and its relationship to the allanite-series minerals. The group name is in honor of Thomas Allan (1777, Edinburgh, Scotland - 1833, Morpeth, Northumberland, England), Scottish banker and mineralogist.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:36831:7

ac328d11-cbab-4452-99fc-f744517e8a98

IMA Classification of Allanite-(Nd)Hide

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IMA Formula:

CaNd(Al2Fe2+)[Si2O7][SiO4]O(OH)

Classification of Allanite-(Nd)Hide

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9.BG.05b

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

58.2.6.4

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

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.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Pronunciation of Allanite-(Nd)Hide

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Pronunciation:

Physical Properties of Allanite-(Nd)Hide

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Transparency:

Translucent, Opaque

Colour:

Dark brown to black

Cleavage:

Imperfect/Fair
Imperfect along {001}.

Density:

3.98 g/cm3 (Measured) 4.04 g/cm3 (Calculated)

Comment:

Calculated using the empirical formula.

Optical Data of Allanite-(Nd)Hide

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RI values:

_n_α = 1.723(5) _n_β = 1.754(7) _n_γ = 1.772(5)

δ = 0.049

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

Dispersion:

Strong, r > v.

Comments:

Moderately pleochroic in larger fragments. α = pale grayish-brown, γ = grayish-brown. Small fragment are colorless.

Chemistry of Allanite-(Nd)Hide

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Mindat Formula:

(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)

Common Impurities:

Al,Ca,Ce,Fe,La,Mg,Mn,Pr,Sm,Ti

Crystallography of Allanite-(Nd)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.8897(5) Å, b = 5.7308(2) Å, c = 10.1010(6) Å
β = 115.166(7)°

Ratio:

a:b:c = 1.551 : 1 : 1.763

Unit Cell V:

465.75 ų (Calculated from Unit Cell)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Åskagen Quarry, Värmland County, Sweden. The data are from the type description.

Geological EnvironmentHide

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Geological Setting:

Pegmatite with unusually extreme LREE enrichment and HREE depletion.

Type Occurrence of Allanite-(Nd)Hide

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General Appearance of Type Material:

Fine-grained aggregates within altered thalénite-(Y) and thin crack fillings. The size of individual grains is less than 0.5 mm.

Place of Conservation of Type Material:

Department of Mineralogy and Petrology, Czech National Museum, Prague (Czech Republic), catalogue no. P1P 1/2010.

Geological Setting of Type Material:

NYF-family granitic pegmatite.

Associated Minerals at Type Locality:

Synonyms of Allanite-(Nd)Hide

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Other Language Names for Allanite-(Nd)Hide

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Relationship of Allanite-(Nd) 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 Allanite-(Nd)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 Allanite-(Nd)Hide

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References for Allanite-(Nd)Hide

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Reference List:

Skoda, R., Cempirek, J., Filip, J., Novak, M., Veselovsky, F., Ctvrtlik, R. (2012) Allanite-(Nd), CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), a new mineral from Askagen, Sweden. American Mineralogist, 97 (5) 983-988 doi:10.2138/am.2012.3936

Hanson, S. L., Falster, A. U., Simmons, W. B., Brown, T. A. (2012) Allanite-(Nd) from the Kingman Feldspar Mine, Mojave Pegmatite District, Northwestern Arizona, USA. The Canadian Mineralogist, 50 (4) 815-824 doi:10.3749/canmin.50.4.815

Localities for Allanite-(Nd)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.