Stornesite-(Y)
A variety of Chladniite
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Formula:
Na3CaMg11(PO4)9
Previously given as {(Y, Ca)}{Na6◻2}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
Colour:
Pale yellow (in standard thin sections)
Specific Gravity:
3.196 (Calculated)
Crystal System:
Trigonal
Name:
For the Stornes Peninsula, where the first recorded locality is situated, and for Yttrium being the dominant REE element in its composition.
An Y-bearing chladniite. Originally described as a new mineral, the Y-dominant analogue of Chladniite by Grew et al. (2006).
Discredited by the IMA in February 2020 (IMA Newsletter 54).
Discredited by the IMA in February 2020 (IMA Newsletter 54).
Unique Identifiers
Mindat ID:
28918 (as Stornesite-(Y))
1008 (as Chladniite)
1008 (as Chladniite)
Long-form identifier:
mindat:1:1:28918:0 (as Stornesite-(Y))
mindat:1:1:1008:1 (as Chladniite)
mindat:1:1:1008:1 (as Chladniite)
IMA Classification of Stornesite-(Y)
Discredited
IMA Formula:
Na6(Ca5Na3)YMg43(PO4)36
Approval year:
2005
First published:
2006
Approval history:
Approved by IMA (2005-040).
Discredited in February 2020 by IMA as it is equivalent to Y-bearing chladniite.
Discredited in February 2020 by IMA as it is equivalent to Y-bearing chladniite.
Classification of Stornesite-(Y)
Dana 7th ed.:
38.2.9.5
Physical Properties of Stornesite-(Y)
Colour:
Pale yellow (in standard thin sections)
Density:
3.196 g/cm3 (Calculated)
Optical Data of Stornesite-(Y)
Type:
Uniaxial (+)
RI values:
nω = 1.6215 nε = 1.625
Max. Birefringence:
δ = 0.004
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.
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.
Surface Relief:
Moderate
Chemistry of Stornesite-(Y)
Mindat Formula:
Na3CaMg11(PO4)9
Previously given as {(Y, Ca)}{Na6◻2}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
Previously given as {(Y, Ca)}{Na6◻2}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
Element Weights:
Crystallography of Stornesite-(Y)
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 14.9628 Å, c = 42.756 Å
Ratio:
a:c = 1 : 2.857
Unit Cell V:
8290 ų
Z:
3
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0004225 | Stornesite-(Y) | Grew E S, Armbruster T, Medenbach O, Yates M G, Carson C J (2006) Stornesite-(Y), (Y, Ca)Vacancy2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, the first terrestrial Mg-dominant member of the fillowite group, from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica American Mineralogist 91 1412-1424 |  | 2006 | Larsemann Hills, Prydz Bay, East Antarctica | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.67 Å | (40) |
| 3.52 Å | (40) |
| 2.94 Å | (60) |
| 2.73 Å | (100) |
| 1.84 Å | (40) |
Comments:
Format: d/Å (I/%) (hkl)
First Recorded Occurrence of Stornesite-(Y)
General Appearance of First Recorded Material:
Anhedral to subhedral, locally euhedral grains with hexagonal or rhombic outlines, up to 1 × 0.25 mm in dimension.
Geological Setting of First Recorded Material:
Constituent of fluorapatite nodules included in paragneiss.
Associated Minerals at First Recorded Locality:
Synonyms of Stornesite-(Y)
Other Language Names for Stornesite-(Y)
German:Stornesit-(Y)
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 Stornesite-(Y)
mindat.org URL:
https://www.mindat.org/min-28918.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Stornesite-(Y)
Reference List:
Grew, Edward S., Armbruster, Thomas, Medenbach, Olaf, Yates, Martin G., Carson, Christopher J. (2006) Stornesite-(Y), (Y, Ca) 2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, the first terrestrial Mg-dominant member of the fillowite group, from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica. American Mineralogist, 91 (8) 1412-1424 doi:10.2138/am.2006.2219
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) . CNMNC Newsletter No 54. Mineralogical Magazine, 84 (2) 359-365 doi:10.1180/mgm.2020.21
Hatert, Frédéric, Grew, Edward S., Vignola, Pietro, Rotiroti, Nicola, Nestola, Fabrizio, Keller, Paul, Baijot, Maxime, Bruni, Yannick, Fransolet, André-Mathieu, Dal Bo, Fabrice, Depret, Martin (2021) Crystal chemistry and nomenclature of fillowite-type phosphates. The Canadian Mineralogist, 59 (4) 781-796 doi:10.3749/canmin.2000043
Localities for Stornesite-(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.
Antarctica | |
| Grew et al. (2006) |
| Grew et al. (2006) +1 other reference |
