Atelisite-(Y)
A valid IMA mineral species
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About Atelisite-(Y)
Formula:
Y4Si3O8(OH)8
Colour:
Pale brown to colorless
Lustre:
Vitreous
Specific Gravity:
4.26 (Calculated)
Crystal System:
Tetragonal
Name:
From the Greek ατελής, deficient, in allusion to the Si-deficiency of the mineral.
Type Locality:
An unusual hydrous yttrium silicate with a KDP-type (monopotassium phosphate) structure.
The X-ray powder diffraction pattern is similar to that of xenotime.
The X-ray powder diffraction pattern is similar to that of xenotime.
Unique Identifiers
Mindat ID:
42350
Long-form identifier:
mindat:1:1:42350:8
Similar Names
| Atalezite | A synonym of Atelestite | |
| Atlasite | near Cu15(CO3)6Cl2(OH)16 · H2O |
IMA Classification of Atelisite-(Y)
Approved
IMA Formula:
Y4Si3O8(OH)8
Approval year:
2010
First published:
2012
Classification of Atelisite-(Y)
9.A0.
9 : SILICATES (Germanates)
A : Nesosilicates
0 :
9 : SILICATES (Germanates)
A : Nesosilicates
0 :
Mineral Symbols
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.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ael-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Atelisite-(Y)
Vitreous
Transparency:
Transparent
Colour:
Pale brown to colorless
Streak:
White
Density:
4.26 g/cm3 (Calculated)
Optical Data of Atelisite-(Y)
Type:
Uniaxial (+)
RI values:
nω = 1.727 nε = 1.8
Max. Birefringence:
δ = 0.073
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:
Moderate
Chemistry of Atelisite-(Y)
Mindat Formula:
Y4Si3O8(OH)8
Element Weights:
Elements listed:
Crystallography of Atelisite-(Y)
Crystal System:
Tetragonal
Class (H-M):
42m - Scalenohedral
Space Group:
I42d
Setting:
I42d
Cell Parameters:
a = 6.947(4) Å, c = 6.133(3) Å
Ratio:
a:c = 1 : 0.883
Unit Cell V:
295.98 ų
Morphology:
Dipyramidally terminated, short-prismatic habit with a diameter of up to 0.3 mm. Observed forms: {101},{100} and {001}.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0019605 | Atelisite-(Y) | Malcherek T, Mihailova B, Schluter J, Husdal T (2012) Atelisite-(Y), a new rare earth defect silicate of the KDP structure type European Journal of Mineralogy 24 1053-1060 | 2012 | Stetind quarry, Tysfjord, Norway | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.581 Å | (45) |
| 3.465 Å | (100) |
| 2.766 Å | (31) |
| 2.596 Å | (58) |
| 2.453 Å | (20) |
| 2.161 Å | (26) |
| 1.841 Å | (23) |
| 1.780 Å | (52) |
Comments:
Pattern is similar to that of xenotime.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Atelisite-(Y)
General Appearance of Type Material:
As a late, hydrothermally formed phase which occurs as euhedral microcrystals in dissolution cavities in yttrian fluorite.
Place of Conservation of Type Material:
In the collections of the Mineralogical Museum of the University of Hamburg, Hamburg, Germany, catalogue number NO-004.
Empirical Formula of Type Material:
(Y3.11Yb0.46 Er0.19Dy0.11Gd0.09Ho0.01Tb0.02)Σ3.99Si2.40O16H10.43
Chemical Analysis of Type Material:
| SiO2 | 18.73 % |
|---|---|
| Y2O3 | 45.67 % |
| Yb2O3 | 11.81 % |
| Gd2O3 | 2.09 % |
| Tb2O3 | 0.54 % |
| Dy2O3 | 2.61 % |
| Ho2O3 | 0.62 % |
| Er2O3 | 4.72 % |
| H2O calc | 12.2 % |
| Total: | 98.99 % |
Geological Setting of Type Material:
Granitic pegmatite (NYF type).
Associated Minerals at Type Locality:
Synonyms of Atelisite-(Y)
Other Language Names for Atelisite-(Y)
Related Minerals - Strunz-mindat Grouping
| 9.A0.05 | Cayalsite-(Y) | CaY6Al2Si4O18F6 |
Other Information
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 Atelisite-(Y)
mindat.org URL:
https://www.mindat.org/min-42350.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Atelisite-(Y)
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 9. Mineralogical Magazine, 75 (4) 2535-2540 doi:10.1180/minmag.2011.075.4.2535
Localities for Atelisite-(Y)
Showing 2 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.
China | |
| Zhao et al. (2022) |
Norway (TL) | |
| Malcherek et al. (2012) +1 other reference |
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Stetind pegmatite, Narvik, Nordland, Norway