Aeschynite-(Y) Mineral Data (original) (raw)
General Aeschynite-(Y) Information
(Y,Ca,Fe)(Ti,Nb)2(O,OH)6
Molecular Weight = 274.97 gm
Calcium 4.37 % Ca 6.12 % CaO
Yttrium 19.40 % Y 24.64 % Y2O3
Titanium 30.47 % Ti 50.84 % TiO2
Niobium 8.45 % Nb 12.08 % Nb2O5
Iron 2.03 % Fe 2.61 % FeO
Hydrogen 0.37 % H 3.28 % H2O
Oxygen 34.91 % O
______ ______
100.00 % 99.56 % = TOTAL OXIDE
Y0.6Ca0.3Fe2+0.1Ti1.75Nb0.25O5(OH)
Approved IMA 1966
Norway, Urstad, Hittero Link to MinDat.org Location Data.
Named for its composition and from the Greek for "shame," in allusion to the inability of chemists, at the time of its discovery, to separate some of its constituents.
Aeschynite-(Y) + Pronunciation
Eschynite
Aeschynite-(Y) Image
Aeschynite-(Y) Comments: Square crystal of aeschynite-(Y) on a matrix of albite, quartz and muscovite. Location: Val. Pellice, Piedmont, Italy.Scale: Crystal Size 1 mm. © John Veevaert |
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Aeschynite-(Y) Crystallography
a:b:c =0.4717:1:0.6748
a = 5.18, b = 10.98, c = 7.41, Z = 4; V = 421.45 Den(Calc)= 4.33
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
By Intensity(I/Io): 2.91(1), 2.99(0.8), 3.07(0.3),
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| | Bonazzi P , Menchetti S , European Journal of Mineralogy , 11 (1999) p.1043-1049, Crystal chemistry of aeschynite-(Y) from the Western Alps:, residual electron density on difference-Fourier map, Sample: TR1, Locality: western Alps View Additional jPOWD Structure files for Aeschynite-(Y) [1] [2] [3] [4] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
Physical Properties of Aeschynite-(Y)
None
Black, Brownish black, Brown, Brownish yellow, Yellowish.
4.85 - 5.13, Average = 4.99
Transparent to subtranslucent
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Massive - Uniformly indistinguishable crystals forming large masses.
5-6 - Between Apatite and Orthoclase
Adamantine - Resinous
reddish yellow
Optical Properties of Aeschynite-(Y)
CI meas= 0.245 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.129 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2637,KPDmeas= 0.2289,KC= 0.303
Ncalc = 2.31 - 2.55
Isotropic, n=2.142.
Calculated Properties of Aeschynite-(Y)
Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Aeschynite-(Y) =4.33 gm/cc.
Fermion Index = 0.04
Boson Index = 0.96
PEAeschynite-(Y) = 43.12 barns/electron
U=PEAeschynite-(Y) x rElectron Density= 176.20 barns/cc.
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aeschynite-(Y) is Not Radioactive
Aeschynite-(Y) Classification
08.03.06.03 (08)Multiple Oxides with Nb, Ta, and Ti
(08.03)where A (B2O6)
(08.03.06)Aeschynite group
08.03.06.01 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
08.03.06.02 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
08.03.06.03 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
08.03.06.04 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
08.03.06.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
08.03.06.06 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
08.03.06.07 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
04.D - Metal:Oxygen = 1:2 and similar
04.DF -With large (� medium-sized) cations; dimers and trimers of edge-sharing octahedra
04.DF.05 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
04.DF.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
04.DF.05 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
04.DF.05 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
04.DF.05 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m
Other Aeschynite-(Y) Information
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Links to other databases for Aeschynite-(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
14 - WWW-MINCRYST
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Aeschynite-(Y)
(Y,Ca,Fe)(Ti,Nb)2(O,OH)6
Dana No: 08.03.06.03 Strunz No: 04.DF.05
Locality:
Notes: