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Ancylite-(La)

Big Photo

Taseqite occurrence, Tasseq Slope (Taseq Slope), Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
© Knut Eldjarn

Formula:
Sr(La,Ce)[OH|(CO
 
3
)
 
2
] · H
 
2
O
System:OrthorhombicLustre:Vitreous
Hardness:4 - 4½
Name:From the Greek αυκιλος for 'curved', in allusion to the rounded and distorted crystal shapes, plus the "-(La)" suffix due to lanthanum being the dominant REE in the composition.


The lanthanum analogue of Ancylite-(Ce).

Classification of Ancylite-(La)

IMA status:Approved 1995
Strunz 8th edition ID:5/E.08-28
Nickel-Strunz 10th (pending) edition ID:5.DC.05

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
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Type Occurrence of Ancylite-(La)

Type Locality:Marchenko Peak, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Physical Properties of Ancylite-(La)

Lustre:Vitreous
Hardness (Mohs):4 - 4½

Crystallography of Ancylite-(La)

Crystal System:Orthorhombic

Optical Data of Ancylite-(La)

Type:Biaxial (+)
RI values: nα = 1.640 nβ = 1.668 nγ = 1.731
2V:Measured: 70° , Calculated: 70°
Maximum Birefringence:δ = 0.091

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v moderate

Chemical Properties of Ancylite-(La)

Formula:
Sr(La,Ce)[OH|(CO
 
3
)
 
2
] · H
 
2
O
Essential elements:C, H, La, O, Sr
All elements listed in formula:C, Ce, H, La, O, Sr

Relationship of Ancylite-(La) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DC.05Ancylite-(Ce)
SrCe[OH|(CO
 
3
)
 
2
] · H
 
2
O
5.DC.05Calcioancylite-(Ce)
(Ca,Sr)Ce(CO
 
3
)
 
2
OH·H
 
2
O
5.DC.05Calcioancylite-(Nd)
(Nd,Ce)
 
3
Ca(CO
 
3
)
 
4
(OH)
 
3
·H
 
2
O
5.DC.05Gysinite-(Nd)
Pb(Nd,La)[OH|(CO
 
3
)
 
2
] · H
 
2
O
5.DC.05Kozoite-(Nd)
(Nd,La,Sm,Pr)[OH|CO
 
3
]
5.DC.05Kozoite-(La)
(La,Nd)(CO
 
3
)(OH)
5.DC.10Kamphaugite-(Y)
Ca(Y,REE)[OH|(CO
 
3
)
 
2
] · H
 
2
O
5.DC.15Sheldrickite
NaCa
 
3
(CO
 
3
)
 
2
F
 
3
·H
 
2
O
5.DC.20Thomasclarkite-(Y)
(Na,Ce)(Y,REE)[(OH)
 
3
|HCO
 
3
] · 4H
 
2
O
5.DC.25Peterbaylissite
(Hg-Hg)
 
1.5
[OH|CO
 
3
] · 2H
 
2
O
5.DC.30Clearcreekite
(Hg-Hg)
 
1.5
[OH|CO
 
3
] · 2H
 
2
O

Other Names for Ancylite-(La)

Synonyms:
IMA1995-053
Other Languages:
German:Ankylith-(La)
Russian:Анкилит-(La)

Other Information

Other Information:Readily soluble in acids.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ancylite-(La)

Reference List:Mineralogical Record: 29: 233.

Zapiski Vserossiyskogo Mineral ogicheskogo Obshchestva: 126(1): 96-108.

Articles/Blogs about Ancylite-(La)

Internet Links for Ancylite-(La)

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  • Raman and XRD data at RRUFF project
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  • Ancylite-(La) details from Handbook of Mineralogy (PDF)
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    Localities for Ancylite-(La)

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Verchères Co.
        • Varennes & St-Amable
          • Saint-Amable sill
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
          • Tasseq Slope (Taseq Slope)
    		Petersen, O.V., Johnsen, O., Niedermayr, G., Grice, J.D. (2004): Taseqite, a new member of the Eudialyte group from the Ilimaussaq alkaline complex, South Greenland, Neues Jahrbuch für Mineralogie, Monatshefte, 2004, No2, 83-96
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Vitim Plateau
            • Biraya and Bya Rivers confluence area (Chara Basin)
    		A. Konev et al.: Eur. J. Min. 17(5):715–721 (2005)
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Kukisvumchorr Mt
    		No reference listed
            • Yukspor Mt
              • Hackman Valley
    		Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480.
    www.koeln.netsurf.de/~w.steffens/lovo.htm
    Mineral and/or Locality
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