Aeschynite-(Y) Mineral Data

General Aeschynite-(Y) Information

Chemical Formula:

(Y,Ca,Fe)(Ti,Nb)2(O,OH)6

Composition:

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

Empirical Formula:

Y_0.6Ca_0.3Fe²⁺_0.1Ti_1.75Nb_0.25O₅(OH)

IMA Status:

Approved IMA 1966

Locality:

Norway, Urstad, Hittero Link to MinDat.org Location Data.

Name Origin:

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.

Name Pronunciation:

Aeschynite-(Y) + Pronunciation

Synonym:

Eschynite

Aeschynite-(Y) Image

Images:

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

Aeschynite-(Y) Crystallography

Axial Ratios:

a:b:c =0.4717:1:0.6748

Cell Dimensions:

a = 5.18, b = 10.98, c = 7.41, Z = 4; V = 421.45 Den(Calc)= 4.33

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.91(1), 2.99(0.8), 3.07(0.3),

Forms:

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Forms: ( 0 2 1) ( 0 1 0) ( 1 2 0) ( 1 1 0) ( 1 1 1)

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Physical Properties of Aeschynite-(Y)

Cleavage:

None

Color:

Black, Brownish black, Brown, Brownish yellow, Yellowish.

Density:

4.85 - 5.13, Average = 4.99

Diaphaneity:

Transparent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Adamantine - Resinous

Streak:

reddish yellow

Optical Properties of Aeschynite-(Y)

Gladstone-Dale:

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

Optical Data:

Isotropic, n=2.142.

Calculated Properties of Aeschynite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Aeschynite-(Y) =4.33 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Aeschynite-(Y)}= 43.12 barns/electron
U=PE_{Aeschynite-(Y)} x rElectron Density= 176.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aeschynite-(Y) is Not Radioactive

Aeschynite-(Y) Classification

Dana Class:

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

Strunz Class:

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 (ï¿½ 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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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:

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