Classification of Stornesite-(Y) |
| IMA status: | Approved 2005 |
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| Strunz 8th edition ID: | 7/A.08-25
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| Nickel-Strunz 10th (pending) edition ID: | 8.AC.50
8 : PHOSPHATES, ARSENATES, VANADATES A : Phosphates, etc. without additional anions, without H2O C : With medium-sized and large cations |
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| Dana 7th edition ID: | 38.2.9.5 |
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| mindat.org URL: | http://www.mindat.org/min-28918.html Please feel free to link to this page. |
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Type Occurrence of Stornesite-(Y) |
| Type Locality: | Johnston Firth, Stornes Peninsula, Larsemann Hills (Larseman Hills), Prydz Bay, Ingrid Christensen Coast, Princess Elizabeth Land, Eastern Antarctica, Antarctica |
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| General Appearance of Type Material: | anhedral to subhedral, locally euhedral grains with hexagonal or rhombic outlines, up to 1 × 0.25 mm in dimension |
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| Geological Setting of type material: | consituent of fluorapatite nodules included in paragneiss |
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| Associated Minerals at type locality: | |
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Physical Properties of Stornesite-(Y) |
| Colour: | Pale yellow (in standard thin sections) |
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| Density (calculated): | 3.196 g/cm3 |
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Crystallography of Stornesite-(Y) |
| Crystal System: | Trigonal |
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| Class (H-M): | 3 - Rhombohedral |
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| Space Group: | R3 |
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| Cell Parameters: | a = 14.9628Å, c = 42.756Å
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| Ratio: | a:c = 1 : 2.857 |
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| Unit Cell Volume: | V 8290 ų |
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| Z: | 3 |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 3.67 | | (40) | | 3.52 | | (40) | | 2.94 | | (60) | | 2.73 | | (100) | | 1.84 | | (40) |
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| Comments: | Format: d/Å (I/%) (hkl) |
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Optical Data of Stornesite-(Y) |
| Type: | Uniaxial (+) |
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| RI values: | nω = 1.622 nε = 1.625 |
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| Maximum Birefringence: | δ = 0.004
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Moderate |
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Chemical Properties of Stornesite-(Y) |
| Formula: | | {(Y, Ca)}{Na | | ◻ | | }{(Ca,Na) | | }{(Mg,Fe | | ) | | }(PO | | ) | | |
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| Essential elements: | Ca, Mg, Na, O, P, Y |
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| All elements listed in formula: | Ca, Fe, Mg, Na, O, P, Y |
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| Analytical Data: | Data from electron microprobe analysis
Empirical formula based on 36 phosphate ions per formula unit
SiO2 (0.02)
P2O5 (48.11)
SO3 (0.05)
MgO (23.16)
MnO (0.24)
FeO (15.55)
Na2O (5.04)
CaO (5.66)
SrO (0.02)
Y2O3 (1.43)
Yb2O3 (0.24)
UO2 (0.01)
Sum = 99.53 wt% |
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| Empirical Formula: | |
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Relationship of Stornesite-(Y) to other Species |
| Member of: | Fillowite Group |
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Other Members of Group:
- + | |
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Related Minerals - Nickel-Strunz Grouping):
- + | |
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Related Minerals - Dana Grouping):
- + | |
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Other Names for Stornesite-(Y) |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Stornesite-(Y) |
Reference List:
- + | Grew, E., Armbruster, Th., Medenbach, O., Yates, M.G., Carson, C.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, 1412-1424. |
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Internet Links for Stornesite-(Y) |
| Search Engines: |
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| External Links: | Look for Stornesite-(Y) on WebmineralLook for Stornesite-(Y) on Athena MineralogyLook for Stornesite-(Y) on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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Localities for Stornesite-(Y) |
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