Gagarinite-(Y) (original) (raw)
A valid IMA mineral species
About Gagarinite-(Y)Hide
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Colour:
Creamy, yellowish, pink.
Specific Gravity:
4.11 - 4.29
Name:
Originally named simply gagarinite in honor of Yuri Alexeevich Gagarin (9 March 1934, Klushino, Smolensk Oblast, Soviet Union - 27 March 1968, Novosyolovo, Soviet Union), cosmonaut and the first person in space. The suffix was added by the IMA in 1987 to denote the dominant rare earth element.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1629:8
d772c902-07c3-41a7-bb88-70dd808dacbf
IMA Classification of Gagarinite-(Y)Hide
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Type description reference:
Classification of Gagarinite-(Y)Hide
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3.AB.35
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
11.5.6.1
11 : HALIDE COMPLEXES
5 : AmBX6
8.7.4
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gag-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gagarinite-(Y)Hide
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Transparency:
Transparent, Translucent
Colour:
Creamy, yellowish, pink.
Hardness:
VHN100=367 - 372 - Vickers
Cleavage:
Distinct/Good
Distinct in one direction, prismatic
Density:
4.11 - 4.29 g/cm3 (Measured) 4.27 g/cm3 (Calculated)
Optical Data of Gagarinite-(Y)Hide
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RI values:
_n_ω = 1.472 - 1.475 _n_ε = 1.490 - 1.493
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
May be anomalously biaxial
Chemistry of Gagarinite-(Y)Hide
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Crystallography of Gagarinite-(Y)Hide
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Class (H-M):
6/m - Dipyramidal
Cell Parameters:
a = 5.987(2) Å, c = 3.5413(7) Å
Unit Cell V:
109.93 ų (Calculated from Unit Cell)
Morphology:
Short and long prismatic hexagonal crystals, irregular grains, aggregates
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005407 | Gagarinite-(Y) | Hughes J M, Drexler J W (1994) Refinement of the structure of gagarinite-(Y), Nax(CaxREE2-x)F6 The Canadian Mineralogist 32 563-565 |  |
1994 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.717 Å | (100 broad) |
| 2.086 Å | (90) |
| 3.00 Å | (50) |
| 2.92 Å | (50) |
| 1.709 Å | (100) |
| 1.726 Å | (90) |
| 2.085 Å | (90) |
| 1.129 Å | (100 doublet) |
| 0.9967 Å | (80) |
| 2.980 Å | (70) |
| 1.012 Å | (70) |
Geological EnvironmentHide
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Geological Setting:
In Na-metasomatized alkalic granites and syenites
Type Occurrence of Gagarinite-(Y)Hide
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Place of Conservation of Type Material:
- Vernadsky Geological Museum, Moscow, Russia, 47307.
- A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 62341–62343.
Geological Setting of Type Material:
In albitized granites and associated quartz-microcline veins.
Associated Minerals at Type Locality:
Reference:
Stepanov, A.V., Severov, E.A. (1961) Gagarinite, a new rare-earth mineral. Doklady Akademii Nauk SSSR: 141: 954-957.
Synonyms of Gagarinite-(Y)Hide
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Other Language Names for Gagarinite-(Y)Hide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of Gagarinite-(Y)Hide
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Other InformationHide
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Thermal Behaviour:
Large endothermal break at 720-750 and a small exothermal break at about 900. When heated the mineral loses water and part of the fluorine above 500.
Special Storage/
Display Requirements:
Decomposed by water. Easily decomposed by HNO3, HCl, and concentrated H2SO4.
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 Gagarinite-(Y)Hide
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References for Gagarinite-(Y)Hide
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Reference List:
Jambor, J. L., Roberts, A. C., Owens, D. R., Grice, J. D. (1996) Zajacite-(Ce), a new rare-earth fluoride from the Strange Lake deposit, Quebec-Labrador. The Canadian Mineralogist, 34 (6) 1299-1304
Sciberras, M. J., Leverett, P., Williams, P. A., Hibbs, D. E., Roberts, A. C., Grice, J. D. (2011) The single-crystal X-ray study of gagarinite-(Ce) The Canadian Mineralogist, 49 (4) 1111-1114 doi:10.3749/canmin.49.4.1111
Localities for Gagarinite-(Y)Hide
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This 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.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.