Minasgeraisite-(Y) Mineral Data

Minasgeraisite-(Y) Mineral Data +

General Minasgeraisite-(Y) Information

Chemical Formula:

CaY2Be2Si2O10

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

Empirical Formula:

CaY₂Be₂(Si₂O₁₀)

Environment:

Granitic pegmatites.

IMA Status:

Approved IMA 1986

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.

Name Origin:

Named after its locality.

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Minasgeraisite-(Y) Crystallography

Axial Ratios:

a:b:c =1.3003:1:0.6217

Cell Dimensions:

a = 9.833, b = 7.562, c = 4.702, Z = 2; beta = 90.46° V = 349.62 Den(Calc)= 4.29

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), 3.11(1), 2.54(0.9),

Physical Properties of Minasgeraisite-(Y)

Cleavage:

[001] Perfect

Color:

Violet, Lilac, Purple.

Density:

4.25

Diaphaniety:

Translucent

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Streak:

pale purple white

Optical Properties of Minasgeraisite-(Y)

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

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)

Electron Density:

r_electron=4.02 gm/cc
note: r_{Minasgeraisite-(Y)}=4.25 gm/cc.

Fermion Index

Fermion Index = 0.04596
Boson Index = 0.95404

Photoelectric:

PE_{Minasgeraisite-(Y)}= 50.42 barns/electron
U=PE_{Minasgeraisite-(Y)} x r_electron= 202.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Minasgeraisite-(Y) is Not Radioactive

Minasgeraisite-(Y) Classification

Dana Class:

54.2.1b.6 (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.29-40 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 Minasgeraisite-(Y) Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.71,p603-607,1986) OPTIC PROP.(Am.Min.,Vol.71,p603-607,1986)

See Also:

Links to other databases for Minasgeraisite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Minasgeraisite-(Y)

CaY2Be2Si2O10
Dana No: 54.2.1b.6 Strunz No: VIII/B.29-40
Locality:

Notes: