Gadolinite-(Y) Mineral Data

General Gadolinite-(Y) Information

Chemical Formula:

Y2Fe++Be2Si2O10

Composition:

Molecular Weight = 467.85 gm

Yttrium 38.01 % Y 48.27 % Y₂O₃

Beryllium 3.85 % Be 10.69 % BeO

Iron 11.94 % Fe 15.36 % FeO

Silicon 12.01 % Si 25.69 % SiO₂

Oxygen 34.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y₂Fe²⁺Be₂(Si₂O₁₀)

Environment:

Pegmatite veins rich in alkaline-earth elements.

IMA Status:

Valid Species (Pre-IMA) 1800

Locality:

Ytterby, Resarï¿½, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after the Finnish chemist, Johan Gadolin (1760-1852), who discovered yttrium. The element gadolinium was also named after Johan Gadolin in 1880.

Name Pronunciation:

Gadolinite-(Y) + Pronunciation

Synonym:

Calciogadolinite

ICSD 40095

PDF 26-1134

Gadolinite-(Y) Image

Images:

Gadolinite-(Y) Calciogadolinite

Comments: Black vitreous, metamict massive gadolinite-(Y) also known as calcian gadolinite.
Location: YtterÃ¸ya Mine, RÃ¸vika, YtterÃ¸ya (island), Levanger, Nord-Trondelag, Norway. Scale: See Image.
© Rruff Database

Gadolinite-(Y) Crystallography

Axial Ratios:

a:b:c =1.3099:1:0.6172

Cell Dimensions:

a = 9.89, b = 7.55, c = 4.66, Z = 2; beta = 90.61° V = 347.94 Den(Calc)= 4.47

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.83(1), 3.13(1), 2.56(0.9),

Physical Properties of Gadolinite-(Y)

Cleavage:

None

Color:

Brown, Green, Green black, Light green, Black.

Density:

4 - 4.5, Average = 4.25

Diaphaneity:

Subtransparent to opaque

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Crystalline - Poor - Occurs primarily as crudely formed crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

greenish gray

Optical Properties of Gadolinite-(Y)

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1775,KPDmeas= 0.1867,KC= 0.19
Ncalc = 1.76 - 1.86

Optical Data:

Biaxial (+), a=1.77, b=1.79, g=1.82, bire=0.0500

Calculated Properties of Gadolinite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.00 gm/cc
note: Specific Gravity of Gadolinite-(Y) =4.25 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Gadolinite-(Y)}= 51.62 barns/electron
U=PE_{Gadolinite-(Y)} x rElectron Density= 206.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gadolinite-(Y) is Not Radioactive

Gadolinite-(Y) Classification

Dana Class:

54.02.01b.03 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.02)with B in [4] coordination

(54.02.01b)Datolite group (Homilite series)

54.02.01b.01 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 2₁/c 2/m

54.02.01b.02 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

54.02.01b.03 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

54.02.01b.04 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 2₁/a 2/m

54.02.01b.05 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

54.02.01b.06 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

Strunz Class:

09.AJ.20 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,

09.AJ.20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 2₁/c 2/m

09.AJ.20 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 2₁/a 2/m

09.AJ.20 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 2₁/a 2/m

09.AJ.20 Datolite CaBSiO4(OH) P 2₁/c 2/m

09.AJ.20 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 2₁/a 2/m

09.AJ.20 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

09.AJ.20 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

09.AJ.20 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

09.AJ.20 Hingganite-(Ce) (Ce,Ca)2([],Fe)Be2Si2O8[(OH),O]2 P 2₁/a 2/m

09.AJ.20 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 2₁/a 2/m

09.AJ.20 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O)(?) Unk (HEX-R) Trig

09.AJ.20 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

Other Gadolinite-(Y) Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Gadolinite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Print or Cut-and-Paste your Gadolinite-(Y) Specimen Label here :

Gadolinite-(Y)

Y2Fe++Be2Si2O10
Dana No: 54.02.01b.03 Strunz No: 09.AJ.20
Locality:

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