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Gadolinite-(Y) Mineral Data

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General Gadolinite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Y2Fe++Be2Si2O10
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y2Fe2+Be2(Si2O10)
Help on Environment: Environment: Pegmatite veins rich in alkaline-earth elements.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1800
Help on Locality: Locality: Ytterby, Resar�, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Gadolinite-(Y) + Pronunciation Say GADOLINITE-(Y)
Help on Synonym: Synonym: Calciogadolinite
  ICSD 40095
  PDF 26-1134

Gadolinite-(Y) Image

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  Gadolinite-(Y)   Calciogadolinite

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

Gadolinite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3099:1:0.6172
Help on Cell Dimensions: Cell Dimensions: a = 9.89, b = 7.55, c = 4.66, Z = 2; beta = 90.61° V = 347.94 Den(Calc)= 4.47
Help on Crystal System: 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/Io): 2.83(1), 3.13(1), 2.56(0.9),

Physical Properties of Gadolinite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Green, Green black, Light green, Black.
Help on Density: Density: 4 - 4.5, Average = 4.25
Help on Diaphaneity: Diaphaneity: Subtransparent to opaque
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Crystalline - Poor - Occurs primarily as crudely formed crystals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: greenish gray

Optical Properties of Gadolinite-(Y)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.77, b=1.79, g=1.82, bire=0.0500

Calculated Properties of Gadolinite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.00 gm/cc
note: Specific Gravity of Gadolinite-(Y) =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEGadolinite-(Y) = 51.62 barns/electron
U=PEGadolinite-(Y) x rElectron Density= 206.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gadolinite-(Y) is Not Radioactive

Gadolinite-(Y) Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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

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Dana No: 54.02.01b.03 Strunz No: 09.AJ.20





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