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 % Y2 O3
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:
CaY2 Be2 (Si2 O10 )
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.
Name Pronunciation:
Minasgeraisite-(Y) + Pronunciation
Minasgeraisite-(Y) Image
Images:
Minasgeraisite-(Y)
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
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 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
Diaphaneity:
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 Ncalc = 1.82 - 1.83
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:
Bulk Density (Electron Density)=4.02 gm/cc note: Specific Gravity of Minasgeraisite-(Y) =4.25 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEMinasgeraisite-(Y) = 50.42 barns/electronU=PEMinasgeraisite-(Y) x r Electron Density= 202.89 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Minasgeraisite-(Y) is Not Radioactive
Minasgeraisite-(Y) Classification
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
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
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 - 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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Minasgeraisite-(Y)
CaY2Be2Si2O10
Dana No: 54.02.01b.06 Strunz No: 09.AJ.20
Locality:
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