Ancylite-(Ce)
A valid IMA mineral species - grandfathered
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About Ancylite-(Ce)
Formula:
CeSr(CO3)2(OH) · H2O
Colour:
Light yellow, orange-yellow, yellow-brown, grey
Lustre:
Dull
Hardness:
4 - 4½
Specific Gravity:
3.95
Crystal System:
Orthorhombic
Member of:
Name:
From the Greek αγκυλός ("ankylos") for "curved", in allusion to its usually rounded and distorted crystal shapes at the type locality, plus the "-(Ce)" suffix due to cerium being the dominant REE in the composition.
The strontium analogue of calcioancylite-(Ce) and gysinite-(Ce). The cerium analogue of ancylite-(La).
See also gysinite-(Nd).
See also gysinite-(Nd).
Unique Identifiers
Mindat ID:
216
Long-form identifier:
mindat:1:1:216:5
Similar Names
| Ancylite | ||
| Ancylite-(Ce)-Calcioancylite-(Ce) Series | A solid-solution series between two end-member minerals | |
| Ancylite-(La) | A valid IMA mineral species | LaSr(CO3)2(OH) · H2O |
| Oncolite | A rock subtype |
IMA Classification of Ancylite-(Ce)
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ce3+Sr(CO3)2(OH)·H2O
First published:
1898
Classification of Ancylite-(Ce)
5.DC.05
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
C : With large cations
16b.1.1.1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : AmBn(XO3)pZqxH2O & with (m+n):p = 1:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : AmBn(XO3)pZq
11.8.18
11 : Carbonates
8 : Carbonates of the rare earths
11 : Carbonates
8 : Carbonates of the rare earths
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Anc-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Ancylite-(Ce)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Ancylite-(Ce)
Dull
Transparency:
Translucent
Comment:
Vitreous to dull on crystal faces, greasy on fracture surfaces.
Colour:
Light yellow, orange-yellow, yellow-brown, grey
Comment:
colourless in transmitted light
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery
Density:
3.95 g/cm3 (Measured)
Optical Data of Ancylite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.625 nβ = 1.7 nγ = 1.735
2V:
Measured: 66° , Calculated: 66°
Max. Birefringence:
δ = 0.110
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v moderate
Optical Extinction:
X = a, Y = b, Z = c
Chemistry of Ancylite-(Ce)
Mindat Formula:
CeSr(CO3)2(OH) · H2O
Element Weights:
Crystallography of Ancylite-(Ce)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 4.97–5.03 Å, b = 8.49–8.53 Å, c = 7.24–7.29 Å
Ratio:
a:b:c = 0.585 : 1 : 0.853
Unit Cell V:
305.49 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Faces frequently dull. Aggregates and crusts of small rounded crystals. Crystals are typically pseudo-octahedral {111}, modified by {120}, with curved faces, or short prismatic [001], to 6 mm.
Comment:
Space group Pmcn
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000454 | Ancylite-(Ce) | dal Negro A, Rossi G, Tazzoli V (1975) The crystal structure of ancylite, (RE)x(Ca,Sr)2-x(CO3)2(OH)x(2-x)H2O American Mineralogist 60 280-284 |  | 1975 | Mont St. Hilaire, Quebec, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.34 Å | (100) |
| 3.71 Å | (100) |
| 2.96 Å | (100) |
| 2.35 Å | (80) |
| 2.09 Å | (70) |
| 2.02 Å | (70) |
| 5.57 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Geological Setting:
An uncommon accessory mineral in some nepheline syenites and carbonatites.
Type Occurrence of Ancylite-(Ce)
General Appearance of Type Material:
Druses
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark.
Geological Setting of Type Material:
Pegmatitic veinlets in nepheline-syenite.
Associated Minerals at Type Locality:
Synonyms of Ancylite-(Ce)
Other Language Names for Ancylite-(Ce)
Dutch:Ancyliet-(Ce)
French:Ancylite-(Ce)
German:Ancylit-(Ce)
Ankylith-(Ce)
Ankylith-(Ce)
Norwegian:Ankylitt-(Ce)
Russian:Анкилит-(Ce)
Simplified Chinese:碳锶铈矿
Traditional Chinese:碳鍶鈰礦
Relationship of Ancylite-(Ce) to other Species
Member of:
Other Members of Ancylite Group:
| Ancylite-(La) | LaSr(CO3)2(OH) · H2O | Orth. mmm(2/m2/m2/m) |
| Calcioancylite-(Ce) | (Ce,Ca,Sr)CO3(OH,H2O) | Orth. mmm(2/m2/m2/m) |
| Calcioancylite-(La) | (LaCa)(CO3)2(OH) · H2O | Orth. mmm(2/m2/m2/m) |
| Calcioancylite-(Nd) | Ca(Nd,La,Ce)(CO3)2(OH).H2O | Mon. m : Pm |
| Gysinite-(Ce) | PbCe(CO3)2(OH) · H2O | Orth. mmm(2/m2/m2/m) |
| Gysinite-(La) | PbLa(CO3)2(OH) · H2O | Orth. mmm(2/m2/m2/m) |
| Gysinite-(Nd) | PbNd(CO3)2(OH) · H2O | Orth. mmm(2/m2/m2/m) |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 25 photos of Ancylite-(Ce) associated with Aegirine | NaFe3+Si2O6 |
| 11 photos of Ancylite-(Ce) associated with Pyrite | FeS2 |
| 10 photos of Ancylite-(Ce) associated with Calcite | CaCO3 |
| 7 photos of Ancylite-(Ce) associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 6 photos of Ancylite-(Ce) associated with Pyrophanite | Mn2+TiO3 |
| 5 photos of Ancylite-(Ce) associated with Serandite | NaMn2+2Si3O8(OH) |
| 5 photos of Ancylite-(Ce) associated with Analcime | Na(AlSi2O6) · H2O |
| 4 photos of Ancylite-(Ce) associated with Strontianite | SrCO3 |
| 4 photos of Ancylite-(Ce) associated with Rhodochrosite | MnCO3 |
| 4 photos of Ancylite-(Ce) associated with Gonnardite | (Na,Ca)2(Si,Al)5O10 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 5.DC. | Gysinite-(Ce) | PbCe(CO3)2(OH) · H2O |
| 5.DC. | Calcioancylite-(La) | (LaCa)(CO3)2(OH) · H2O |
| 5.DC. | Gysinite-(La) | PbLa(CO3)2(OH) · H2O |
| 5.DC.05 | Kozoite-(La) | La(CO3)(OH) |
| 5.DC.05 | Calcioancylite-(Ce) | (Ce,Ca,Sr)CO3(OH,H2O) |
| 5.DC.05 | Calcioancylite-(Nd) | Ca(Nd,La,Ce)(CO3)2(OH).H2O |
| 5.DC.05 | 'Unnamed (Ce-analogue of Kozoite-(La) and -(Nd))' | (Ce,La)(CO3)(OH) |
| 5.DC.05 | Ancylite-(La) | LaSr(CO3)2(OH) · H2O |
| 5.DC.05 | Kozoite-(Nd) | Nd(CO3)(OH) |
| 5.DC.05 | Gysinite-(Nd) | PbNd(CO3)2(OH) · H2O |
| 5.DC.10 | Kamphaugite-(Y) | Ca(Y,REE)(CO3)2(OH) · H2O |
| 5.DC.15 | Sheldrickite | NaCa3(CO3)2F3 · H2O |
| 5.DC.20 | Thomasclarkite-(Y) | (Na,Ce)(Y,REE)(HCO3)(OH)3 · 4H2O |
| 5.DC.25 | Peterbaylissite | [Hg2]2+3[CO3]2(OH)2 · 4H2O |
| 5.DC.30 | Clearcreekite | [Hg2]2+3[CO3]2(OH)2 · 4H2O |
| 5.DC.35 | Niveolanite | NaBe(CO3)(OH) · 2H2O |
Other Information
Notes:
Readily soluble in acids.
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 Ancylite-(Ce)
mindat.org URL:
https://www.mindat.org/min-216.html
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Please feel free to link to this page.
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References for Ancylite-(Ce)
Reference List:
Flink, Gust. (1898) Berättelse om en Mineralogsik Resa i Syd-Grönland sommaren 1897. [Narrative of a Mineralogical Journey in South Greenland in the summer of 1897]. Meddelelser om Grønland, 14. 221-262 doi:10.7146/mog.v14.139846as "gult anataslikt" [Yellow anatase-like] and "Små ljusa oktaedrar" [small light-colored octahedra]
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin 679. US Geological Survey doi:10.3133/b679 p.39
Dal Negro, Alberto, Rossi, Guiseppe, Tazzoli, Vittorio (1975) The crystal structure of ancylite, (RE)x(Ca,Sr)2-x(CO3)2(OH)x·(2-x)H2O. American Mineralogist, 60 (3-4) 280-284
Pekov, I. V.; Petersen, O. V.; Voloshin, A. V. (1997) Calcio-ancylite-(Ce) from Ilímaussaq and Narssârssuk, Greenland, Kola peninsula and Polar Urals, Russia; ancylite-(Ce)-calcio-ancylite-(Ce) an isomorphous series. Neues Jahrbuch für Mineralogie - Abhandlungen, 171 (3). 309-322 doi:10.1127/njma/171/1997/309
Localities for Ancylite-(Ce)
Showing 142 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
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