Gadolinite Subgroup
A group of related mineral species
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About Gadolinite Subgroup
Formula:
A3+2MBe2+2Si4+2O8φ2
A = Y, Ce, REE
M = Fe, ◻ (vacancy)
φ = O, OH.
M = Fe, ◻ (vacancy)
φ = O, OH.
Member of:
Name:
The gadolinite subgroup has its name after the generic name gadolinite. Established as a subgroup of the gadolinite group of the gadolinite supergroup by IMA in aug. 2016 (Proposal 16-A).
A subgroup of the Gadolinite Group in the Gadolinite Supergroup.
The gadolinite subgroup is defined by that the A site being dominantly occupied by trivalent cations and the Q site by divalent cations.
The gadolinite subgroup is defined by that the A site being dominantly occupied by trivalent cations and the Q site by divalent cations.
Unique Identifiers
Mindat ID:
50363
Long-form identifier:
mindat:1:1:50363:7
IMA Classification of Gadolinite Subgroup
IMA status notes:
IMA Approved Group Name
Chemistry of Gadolinite Subgroup
Mindat Formula:
A3+2MBe2+2Si4+2O8φ2
A = Y, Ce, REE
M = Fe, ◻ (vacancy)
φ = O, OH.
A = Y, Ce, REE
M = Fe, ◻ (vacancy)
φ = O, OH.
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | |
|---|---|---|---|
| SiO2 | 22.99 % | 28.85 % | 28.84 % |
| BeO | 8.83 % | 12.17 % | |
| Al2O3 | 0.02 % | 0.90 % | |
| B2O3 | 0.55 % | ||
| TiO2 | 0.25 % | ||
| FeO | 10.65 % | 3.93 % | 9.83 % |
| MnO | 1.89 % | ||
| MgO | 0.33 % | ||
| CaO | 2.15 % | 5.66 % | 7.44 % |
| Na2O | 0.11 % | ||
| K2O | 0.52 % | ||
| Y2O3 | 14.82 % | 37.34 % | 34.90 % |
| La2O3 | 9.07 % | 1.35 % | 1.61 % |
| Ce2O3 | 15.55 % | 4.90 % | 2.75 % |
| Nd2O3 | 0.55 % | 0.30 % | |
| H2O | 3.3 % | ||
| Total: | 87.73 % | 83.48 % | 101.14 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 3 | (Y1.285Ca0.55Ce0.07La0.04Nd0.01)Σ1.955(Fe2+0.57◻0.43)Be2.02Si1.995O8.48(OH)1.52 |
Sample references:
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) |
|---|---|---|---|---|---|---|---|
| 0004599 | Gadolinite-(Y) | Camara F, Oberti R, Ottolini L, Ventura G D, Bellatreccia F (2008) The crystal chemistry of Li in gadolinite American Mineralogist 93 996-1004 |  | 2008 | Vico lake, Latium, Italy | 0 | 293 |
| 0019357 | Hingganite-(Y) | Miyawaki R, Matsubara S, Yokoyama K, Okamoto A (2007) Hingganite-(Ce) and hingganite-(Y) from Tahara, Hirukawa-mura, Gifu Prefecture, Japan: The description on a new mineral species of the Ce-analogue of hingannite-(Y) with a refinement of the crystal structure of hingganite-(Y) Journal of Mineralogical and Petrological Sciences 102 1-7 | 2007 | Tahara, Hirukawa-mura, Gifu Prefecture, Japan | 0 | 293 | |
| 0005728 | Hingganite-(Y) | DeMartin F, Minaglia A, Gramaccioli C M (2001) Characterization of gadolinite-group minerals using crystallographic data only: The case of hingganite-(Y) from Cuasso al Monte, Italy Sample 3 The Canadian Mineralogist 39 1105-1114 | | 2001 | Cuasso al Monte, Italy | 0 | 293 |
| 0005727 | Hingganite-(Y) | DeMartin F, Minaglia A, Gramaccioli C M (2001) Characterization of gadolinite-group minerals using crystallographic data only: The case of hingganite-(Y) from Cuasso al Monte, Italy Sample 2 The Canadian Mineralogist 39 1105-1114 | | 2001 | Cuasso al Monte, Italy | 0 | 293 |
| 0005726 | Hingganite-(Y) | DeMartin F, Minaglia A, Gramaccioli C M (2001) Characterization of gadolinite-group minerals using crystallographic data only: The case of hingganite-(Y) from Cuasso al Monte, Italy Sample 1 The Canadian Mineralogist 39 1105-1114 | | 2001 | Cuasso al Monte, Italy | 0 | 293 |
| 0005292 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | Glogstafelberg, Val Formazza, Italy | 0 | 293 |
| 0005291 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | Monte Bassetta, Val Vigezzo, Italy | 0 | 293 |
| 0005290 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | "Bosco", Val Vigezzo, Italy | 0 | 293 |
| 0005289 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | "Strada", Val Vigezzo, Italy | 0 | 293 |
| 0005288 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | Val Nalps, Switzerland | 0 | 293 |
| 0005287 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | Beura, Ossola, Italy | 0 | 293 |
| 0005286 | Gadolinite-(Y) | Demartin F, Pilati T, Diella V, Gentile P, Gramaccioli C M (1993) A crystal-chemical investigation of alpine gadolinite The Canadian Mineralogist 31 127-136 | | 1993 | Moos, Rauris, Austria | 0 | 293 |
| 0012659 | Hingganite-(Ce) | Lulu X M, Zhi-Zhong P (1986) Crystal structure of xinganite Geochemistry 5 280-285 | 1986 | Daxinganling, China | 0 | 293 | |
| 0015584 | Hingganite-(Y) | Yakubovich O V, Matvienko E N, Voloshin A V, Simonov M A (1983) The crystal structure of hingganite-(Yb), (Y0.51TR0.36Ca0.13)*Fe0.065Be[SiO4](OH) Soviet Physics Crystallography 28 269-271 | 1983 | amazonite pegmatites, Kola peninsula, Russia | 0 | 293 | |
| 0000960 | Gadolinite-(Y) | Miyawaki R, Nakai I, Nagashima K (1984) A refinement of the crystal structure of gadolinite American Mineralogist 69 948-953 | | 1984 | 0 | 293 | |
| 0014186 | Hingganite-(Yb) | Yakubovich O V, Matvinenko E N, Voloshin A V, Simonov M A (1983) The crystal structure of hingganite-(Yb), (Y0.51Yb0.36Ca0.13)Fe0.065Be[SiO4](OH) Kristallografiya 28 457-460 | 1983 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Gadolinite Subgroup to other Species
Member of:
Other Members of Gadolinite Group:
| Datolite Subgroup | Ca2+2MB3+2Si4+2O8φ2 |
Gadolinite Subgroup Members:
| 'Calcybeborosilite-(Y)' | (Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2 | Mon. |
| Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 | Mon. 2/m |
| Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 | Mon. 2/m : P21/b |
| Gadolinite-(Y) | Y2Fe2+Be2Si2O10 | Mon. 2/m : P21/b |
| Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : P21/b |
| Hingganite-(Nd) | Nd2◻Be2Si2O8(OH)2 | Mon. 2/m : P21/b |
| Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : P21/b |
| Hingganite-(Yb) | (Yb,Y,REE)2◻Be2[SiO4]2(OH)2 | Mon. 2/m : P21/b |
| 'Minasgeraisite-(Y)' | (Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4 | Tric. 1 : P1 |
| 'Unnamed (OH-analogue of Gadolinite-(Y))' | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 | Mon. 2/m |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
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 Gadolinite Subgroup
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References for Gadolinite Subgroup
Localities for Gadolinite Subgroup
Showing 402 localities.
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The Locality List
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- 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.
Iveland, Agder, Norway