Monazite-(Gd)
A valid IMA mineral species
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Formula:
Gd(PO4)
Specific Gravity:
5.55 (Calculated)
Crystal System:
Monoclinic
Member of:
Dimorph of:
The associated xenotime-(Y) and hingganite-(Y) are both Gd-rich. Compare xenotime-(Gd) and lepersonnite-(Gd).
Gadolinium dominance is very rare among minerals.
Genesis: "selective complexing and enrichment in middle REE in low-temperature hydrothermal fluids by alteration of primary uraninite, brannerite and fluorapatite (...)" (Ondrejka et al., 2023).
Gadolinium dominance is very rare among minerals.
Genesis: "selective complexing and enrichment in middle REE in low-temperature hydrothermal fluids by alteration of primary uraninite, brannerite and fluorapatite (...)" (Ondrejka et al., 2023).
Unique Identifiers
Mindat ID:
470481
Long-form identifier:
mindat:1:1:470481:8
GUID
(UUID V4):
(UUID V4):
82b1c972-2e5e-4f11-b4e9-b72c1321efc3
IMA Classification of Monazite-(Gd)
Approved
Approval year:
2022
Type description reference:
Ondrejka, Martin, Uher, Pavel, Ferenc, Štefan, Majzlan, Juraj, Pollok, Kilian, Mikuš, Tomáš, Milovská, Stanislava, Molnárová, Alexandra, Škoda, Radek, Kopáčik, Richard, Kurylo, Sergii, Bačík, Peter (2023) Monazite-(Gd), a new Gd-dominant mineral of the monazite group from the Zimná Voda REE–U–Au quartz vein, Prakovce, Western Carpathians, Slovakia. Mineralogical Magazine, 87 (4) 568-574 doi:10.1180/mgm.2023.37
Classification of Monazite-(Gd)
8.AD.
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Mnz-Gd | 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 Monazite-(Gd)
Density:
5.55 g/cm3 (Calculated)
Chemistry of Monazite-(Gd)
Mindat Formula:
Gd(PO4)
Elements listed:
Chemical Analysis
Empirical formulas:
Sample ID | Empirical Formula |
---|---|
1 | (Gd0.30Sm0.24Nd0.15Ce0.10La0.05Dy0.03Y0.03Tb0.02Eu0.02Pr0.02Ca0.01)0.98P1.01O4 |
Sample references:
ID | Locality | Reference | Notes |
---|---|---|---|
1 | Zimná Voda uranium occurrence, Prakovce, Gelnica District, Košice Region, Slovakia | EPMA, 4 oxygen atoms |
Crystallography of Monazite-(Gd)
Crystal System:
Monoclinic
Cell Parameters:
a = 6.703(1) Å, b = 6.914(1) Å, c = 6.383(1) Å
β = 103.8(1)°
β = 103.8(1)°
Ratio:
a:b:c = 0.969 : 1 : 0.923
Unit Cell V:
287.28 ų (Calculated from Unit Cell)
Z:
4
Comment:
Spacegroup is P21/n
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.450 Å | (32) |
3.227 Å | (68) |
3.024 Å | (100) |
2.804 Å | (48) |
2.394 Å | (54) |
2.335 Å | (25) |
2.140 Å | (24) |
1.833 Å | (28) |
Comments:
From Type Description.
Type Occurrence of Monazite-(Gd)
General Appearance of Type Material:
anhedral domains, ≤100 (usually 10–50 ) μm in diameter
Place of Conservation of Type Material:
Type material is deposited in the collections of the De- partment of Mineralogy, Petrology and Economic Geology, Comenius University, Ilkoviˇcova 6, 842 15, Bratislava, Slovakia, catalogue number MMUK7660
Geological Setting of Type Material:
quartz-muscovite vein within phyllites, in a granite exocontact
Associated Minerals at Type Locality:
Synonyms of Monazite-(Gd)
Other Language Names for Monazite-(Gd)
German:Monazit-(Gd)
Relationship of Monazite-(Gd) to other Species
Member of:
Other Members of this group:
Cheralite | CaTh(PO4)2 | Mon. 2/m |
Gasparite-(Ce) | Ce(AsO4) | Mon. 2/m |
Gasparite-(La) | La(AsO4) | Mon. 2/m |
Huttonite | ThSiO4 | Mon. 2/m |
Monazite | REE(PO4) | |
Rooseveltite | Bi(AsO4) | Mon. 2/m |
Unnamed (Nd-dominant Gasparite) | NdAsO4 | Mon. 2/m |
Related Minerals - Strunz-mindat Grouping
8.AD. | Keplerite | Ca9(Ca0.5◻0.5)Mg(PO4)7 |
8.AD. | Deynekoite | Ca9◻Fe3+(PO4)7 |
8.AD. | Mazorite | Ba3(PO4)2 |
8.AD.05 | Nahpoite | Na2(PO3OH) |
8.AD.10 | Monetite | Ca(PO3OH) |
8.AD.10 | Weilite | Ca(HAsO4) |
8.AD.10 | Švenekite | Ca(H2AsO4)2 |
8.AD.15 | Archerite | (K,NH4)(H2PO4) |
8.AD.15 | Biphosphammite | NH4(H2PO4) |
8.AD.20 | Phosphammite | (NH4)2(PO3OH) |
8.AD.25 | Buchwaldite | NaCa(PO4) |
8.AD.30 | Schultenite | Pb(HAsO4) |
8.AD.35 | Chernovite-(Y) | Y(AsO4) |
8.AD.35 | Dreyerite | Bi(VO4) |
8.AD.35 | Wakefieldite-(Ce) | Ce(VO4) |
8.AD.35 | Wakefieldite-(Y) | Y(VO4) |
8.AD.35 | Xenotime-(Y) | Y(PO4) |
8.AD.35 | Chernovite-(Ce) | (Ce,Y)(AsO4) |
8.AD.35 | Pretulite | Sc(PO4) |
8.AD.35 | Xenotime-(Yb) | Yb(PO4) |
8.AD.35 | Wakefieldite-(La) | La(VO4) |
8.AD.35 | Wakefieldite-(Nd) | Nd(VO4) |
8.AD.35 | Xenotime-(Gd) | Gd(PO4) |
8.AD.40 | Pucherite | Bi(VO4) |
8.AD.45 | Ximengite | Bi(PO4) |
8.AD.50 | Gasparite-(Ce) | Ce(AsO4) |
8.AD.50 | Monazite-(Ce) | Ce(PO4) |
8.AD.50 | Monazite-(La) | La(PO4) |
8.AD.50 | Monazite-(Nd) | Nd(PO4) |
8.AD.50 | Rooseveltite | Bi(AsO4) |
8.AD.50 | Cheralite | CaTh(PO4)2 |
8.AD.50 | Monazite-(Sm) | Sm(PO4) |
8.AD.50 | UM2005-35-VO:CaFePSiTh | (Th,Ca)(VO4,SiO4,PO4) |
8.AD.50 | Gasparite-(La) | La(AsO4) |
8.AD.55 | Tetrarooseveltite | Bi(AsO4) |
8.AD.60 | Chursinite | [Hg2]2+Hg2+2[AsO4]2 |
8.AD.65 | Clinobisvanite | Bi(VO4) |
8.AD.70 | Gurimite | Ba3(VO4)2 |
8.AD.75 | Picaite | NaCa[AsO3OH][AsO2(OH)2] |
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 Monazite-(Gd)
mindat.org URL:
https://www.mindat.org/min-470481.html
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References for Monazite-(Gd)
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 70. European Journal of Mineralogy, 34 (6) 591-601 doi:10.5194/ejm-34-591-2022
Ondrejka, Martin, Uher, Pavel, Ferenc, Štefan, Majzlan, Juraj, Pollok, Kilian, Mikuš, Tomáš, Milovská, Stanislava, Molnárová, Alexandra, Škoda, Radek, Kopáčik, Richard, Kurylo, Sergii, Bačík, Peter (2023) Monazite-(Gd), a new Gd-dominant mineral of the monazite group from the Zimná Voda REE–U–Au quartz vein, Prakovce, Western Carpathians, Slovakia. Mineralogical Magazine, 87 (4) 568-574 doi:10.1180/mgm.2023.37
Ondrejka, Martin, Uher, Pavel, Ferenc, Štefan, Milovská, Stanislava, Mikuš, Tomáš, Molnárová, Alexandra, Škoda, Radek, Kopáčik, Richard, Bačík, Peter (2023) Gadolinium-dominant monazite and xenotime: Selective hydrothermal enrichment of middle REE during low-temperature alteration of uraninite, brannerite, and fluorapatite (the Zimná Voda REE-U-Au quartz vein, Western Carpathians, Slovakia) American Mineralogist, 108 (4) 754-768 doi:10.2138/am-2022-8418
Localities for Monazite-(Gd)
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).
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.
All localities listed without proper references should be considered as questionable.
Myanmar | |
| Pavel M. Kartashov analytical data |
Slovakia (TL) | |
| Miyawaki et al. (2022) +1 other reference |