Gadolinite-(Y) Mineral Data

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

Synonym:

ICSD 40095

PDF 26-1134

Search for Gadolinite-(Y) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Gadolinite-(Y) using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Gadolinite-(Y) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Gadolinite-(Y) Mineral Data :

Ask about Gadolinite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: