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Gadolinite-(Y)

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Johan Gadolin
Formula:
Y2Fe2+Be2Si2O10
Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
System:
Monoclinic
Colour:
Black, greenish-black, ...
Lustre:
Vitreous, Greasy
Hardness:
6½ - 7
Name:
Named after J. Gadolin (1760-1852), discoverer of yttrium and the "-(Y)" suffix due to the dominance of yttrium in the composition.
Gadolinite-Datolite Group. The yttrium analogue of gadolinite-(Ce).
Difficult to distinguish from hingganite-(Y).

Classification of Gadolinite-(Y)

Approved
9.AJ.20

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.2.1b.3

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
14.3.23

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Type Occurrence of Gadolinite-(Y)

Occurrences of Gadolinite-(Y)

Geological Setting:
Granites and alkalic granitic pegmatites

Physical Properties of Gadolinite-(Y)

Vitreous, Greasy
Diaphaneity (Transparency):
Opaque
Colour:
Black, greenish-black, brown
Streak:
Grayish green
Hardness (Mohs):
6½ - 7
Tenacity:
Brittle
Fracture:
Splintery, Conchoidal
Density:
4.36 - 4.77 g/cm3 (Measured)    4.41 g/cm3 (Calculated)

Crystallography of Gadolinite-(Y)

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 10Å, b = 7.565(2) Å, c = 4.768(1) Å
β = 90.31(2)°
Ratio:
a:b:c = 1.322 : 1 : 0.63
Unit Cell Volume:
V 360.69 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic, massive

Optical Data of Gadolinite-(Y)

Type:
Biaxial (+)
RI values:
nα = 1.770 nβ = 1.790 nγ = 1.820
2V:
Measured: 85°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v distinct

Chemical Properties of Gadolinite-(Y)

Formula:
Y2Fe2+Be2Si2O10

Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
All elements listed in formula:

Relationship of Gadolinite-(Y) to other Species

Other Members of Group:
BakeriteCa4(H5B5Si3O20)
Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
DatoliteCa(HBSiO5)
Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
HomiliteCa2(Fe2+,Mg)B2Si2O10
Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4
9.AJ.20BakeriteCa4(H5B5Si3O20)
9.AJ.20DatoliteCa(HBSiO5)
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14
9.AJ.40JadariteLiNaSiB3O7(OH)
14.3.1PhenakiteBe2SiO4
14.3.2BertranditeBe4(Si2O7)(OH)2
14.3.3BerylliteBe3(SiO4)(OH)2 · H2O
14.3.4LiberiteLi2BeSiO4
14.3.5ChkaloviteNa2BeSi2O6
14.3.6EudidymiteNa2Be2Si6O15 · H2O
14.3.7EpididymiteNa2Be2Si6O15 · H2O
14.3.8GugiaiteCa2Be(Si2O7)
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4
14.3.11BaryliteBe2Ba(Si2O7)
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4
14.3.17TrimeriteCaMn22+Be3(SiO4)3
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Other Names for Gadolinite-(Y)

Name in Other Languages:

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.

References for Gadolinite-(Y)

Reference List:
Geijer (1788): Vom Hrn Berm Geijer in Stochkholm. Chemische Annalen [Crell's Annalen] für die Freunde der Naturlehre, Arzneygelahrtheit, Haushaltungskunst und Manufacturen. Erster Band 1788 [First Volume], p. 229-230.[First description]

Klaproth, M.H. (1802): Chemische Untersuchung des Gadolinits, Beiträge zur chemischen Kenntniss der Mineralkörper, Dritter Band, Rottmann Berlin, 52-79

Petersson, W. (1890): Studier öfver gadolinit. Geologiska Föreningen i Stockholm Förhandlingar. 12, 275-347

Miyawaki, R., Nakai, I., Nagashima, K. (1984): A refinement of the crystal structure of gadolinite. American Mineralogist, 69, 948-953. [gadolinite-(Y)]

DeMartin, F., Pilati, T., Diella, V., Gentile, P. & Gramaccioli, C. M. (1993): A crystal-chemical investigation of Alpine gadolinite. Canadian Mineralogist. 31, 127-136. [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.

Internet Links for Gadolinite-(Y)

Localities for Gadolinite-(Y)

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