Gadolinite-(Y) Mineral Data

Gadolinite-(Y) Mineral Data +

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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, Resarö, Sweden. Link to MinDat.org Location Data.

Synonym:

ICSD 40095

PDF 26-1134

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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 - PrismaticH-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),

Crystal Structure:

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

Physical Properties of Gadolinite-(Y)

Cleavage:

None

Color:

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

Density:

4 - 4.5, Average = 4.25

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Gadolinite-(Y)

Electron Density:

r_electron=4.00 gm/cc
note: r_{Gadolinite-(Y)}=4.25 gm/cc.

Fermion Index

Fermion Index = 0.04682
Boson Index = 0.95318

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gadolinite-(Y) is Not Radioactive

Gadolinite-(Y) Classification

Dana Class:

54.2.1b.3 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.2)with B in [4] coordination

(54.2.1b)Datolite group (Homilite series)

54.2.1b.1 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

54.2.1b.2 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

54.2.1b.3 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

54.2.1b.4 Calciogadolinite* CaREE(Fe)Be2Si2O10 P 2₁/a 2/m

54.2.1b.5 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

54.2.1b.6 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

Strunz Class:

VIII/B.29-50 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.29 - Datolite/Gadolinite group

VIII/B.29-10 Datolite CaBSiO4(OH) P 2₁/c 2/m

VIII/B.29-20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

VIII/B.29-30 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

VIII/B.29-35 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1

VIII/B.29-40 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

VIII/B.29-50 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

VIII/B.29-60 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

VIII/B.29-70 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-80 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.29-90 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-100 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Gadolinite-(Y)

Y2Fe++Be2Si2O10
Dana No: 54.2.1b.3 Strunz No: VIII/B.29-50
Locality:

Notes: