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Minasgeraisite-(Y) Mineral Data

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General Minasgeraisite-(Y) Information

Help on Chemical  Formula: Chemical Formula: CaY2Be2Si2O10
Help on Composition: Composition: Molecular Weight = 452.08 gm
   Calcium     8.87 %  Ca   12.40 % CaO
   Yttrium    39.33 %  Y    49.95 % Y2O3
   Beryllium   3.99 %  Be   11.07 % BeO
   Silicon    12.43 %  Si   26.58 % SiO2
   Oxygen     35.39 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaY2Be2(Si2O10)
Help on Environment: Environment: Granitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: The Jaguaracu Pegmatite, Minas Gerais, Brazil. Also known as the Jose Miranda mine or the Ze Pinto or Jose Pinto mine. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Minasgeraisite-(Y) + Pronunciation Say MINASGERAISITE-(Y)

Minasgeraisite-(Y) Image

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Comments: SEM image of spherical aggregate of growth-zoned minasgeraisite crystals showing elongation along a and simple pedion termination. (AmMin, v71:603).
Location: Lawa de Sr. Jose Pinto pegmatite body, Jaguaracu, Municipo de Timoteo, Minas Gerais, Brazil. Scale: Tick Marks 10 µm.
© American Mineralogist

Minasgeraisite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3003:1:0.6217
Help on Cell Dimensions: Cell Dimensions: a = 9.833, b = 7.562, c = 4.702, Z = 2; beta = 90.46° V = 349.62 Den(Calc)= 4.29
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), 3.11(1), 2.54(0.9),

Physical Properties of Minasgeraisite-(Y)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Violet, Lilac, Purple.
Help on Density: Density: 4.25
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: pale purple white

Optical Properties of Minasgeraisite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1772,KPDmeas= 0.1788,KC= 0.1928
Ncalc = 1.82 - 1.83
Help on Optical Data: Optical Data: Biaxial (+), a=1.74, b=1.754, g=1.786, bire=0.0460, 2V(Calc)=68, 2V(Meas)=68.

Calculated Properties of Minasgeraisite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.02 gm/cc
note: Specific Gravity of Minasgeraisite-(Y) =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEMinasgeraisite-(Y) = 50.42 barns/electron
U=PEMinasgeraisite-(Y) x rElectron Density= 202.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Minasgeraisite-(Y) is Not Radioactive

Minasgeraisite-(Y) Classification

Help on  Dana Class: Dana Class: 54.02.01b.06 (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 Minasgeraisite-(Y) Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.71,p603-607,1986) OPTIC PROP.(Am.Min.,Vol.71,p603-607,1986)
Help on See Also: See Also: Links to other databases for Minasgeraisite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: 54.02.01b.06 Strunz No: 09.AJ.20





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