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Ancylite-(La)

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Big Photo

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

Show Ancylite-(La) Photos (2)



Formula:
Sr(La,Ce)(CO
 
3
)
 
2
(OH) · H
 
2
O
System:OrthorhombicColour:Colorless, pale ...
Lustre:VitreousHardness:4 - 4½
Member of:Ancylite Group
Name:From the Greek αγκυλός ("ankylos") for "curved", in allusion to its usually 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
Place of Conservation of Type Material:St. Petersburg Mining Institute, St. Petersburg, 2092/1; Geological Museum, Kola Scientific Center, Apatity, Russia.
Geological Setting of type material:A rare mineral in nepheline syenites in differentiated alkalic massifs.
Associated Minerals at type locality:
NenadkevichiteNenadkevichiteLoparite-(Ce)FluorapatiteEudialyte
Donnayite-(Y)CatapleiiteCalciteBelovite-(Ce)Belovite-(Ce)
AstrophylliteApophylliteAegirine

Physical Properties of Ancylite-(La)

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Colorless, pale yellowish gray, yellowish brown, yellow
Comment: colorless to pale yellow in thin section.
Streak:White
Hardness (Mohs):4 - 4½
Tenacity:Brittle
Fracture:Conchoidal

Crystallography of Ancylite-(La)

Crystal System:Orthorhombic
Morphology:Crystals are dipyramidal {111}, with {120}, {101}, platy or short prismatic, faces typically curved, to 2 mm; in druses and uncommonly as skeletal or dendritic aggregates.

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)(CO
 
3
)
 
2
(OH) · 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

Member of:Ancylite Group
Other Members of Group:

- +
Ancylite-(Ce)
SrCe(CO
 
3
)
 
2
(OH) · H
 
2
O
Calcioancylite-(Ce)
(Ca,Sr)Ce(CO
 
3
)
 
2
(OH) · H
 
2
O
Calcioancylite-(Nd)
Ca(Nd,La,Ce)(CO
 
3
)
 
2
(OH)
 
.
H
 
2
O
Kozoite-(La)
(La,Nd)(CO
 
3
)(OH)
Kozoite-(Nd)
(Nd,La,Sm,Pr)(CO
 
3
)(OH)
Related Minerals - Nickel-Strunz Grouping):

- +
5.DC.05Ancylite-(Ce)
SrCe(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Ce)
(Ca,Sr)Ce(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Calcioancylite-(Nd)
Ca(Nd,La,Ce)(CO
 
3
)
 
2
(OH)
 
.
H
 
2
O
5.DC.05Gysinite-(Nd)
Pb(Nd,La)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.05Kozoite-(Nd)
(Nd,La,Sm,Pr)(CO
 
3
)(OH)
5.DC.05Kozoite-(La)
(La,Nd)(CO
 
3
)(OH)
5.DC.10Kamphaugite-(Y)
Ca(Y,REE)(CO
 
3
)
 
2
(OH) · H
 
2
O
5.DC.15Sheldrickite
NaCa
 
3
(CO
 
3
)
 
2
F
 
3
 · H
 
2
O
5.DC.20Thomasclarkite-(Y)
(Na,Ce)(Y,REE)(HCO
 
3
)(OH)
 
3
 · 4H
 
2
O
5.DC.25Peterbaylissite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.30Clearcreekite
(Hg
+
2
)
 
1.5
(CO
 
3
)(OH) · 2H
 
2
O
5.DC.35Niveolanite
NaBe(CO
 
3
)(OH) · 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.

Internet Links for Ancylite-(La)

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    • Localities for Ancylite-(La)

    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.
    Hide Locality List
    (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
      • Montérégie
        • Lajemmerais RCM
          • Varennes & St-Amable
            • Saint-Amable sill
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
          • Tasseq area
            • Tasseq Slopes (Taseq Slopes)
    		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
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
          • 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
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
            • Yukspor Mt
              • Hackman Valley
    		Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480.
    www.koeln.netsurf.de/~w.steffens/lovo.htm
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