Aeschynite-(Y) Mineral Data

Aeschynite-(Y) Mineral Data +

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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.

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 - DipyramidalH-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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Crystal Structure:

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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)

Cleavage:

None

Color:

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

Density:

4.85 - 5.13, Average = 4.99

Diaphaniety:

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

Optical Data:

Isotropic, n=2.142.

Calculated Properties of Aeschynite-(Y)

Electron Density:

r_electron=4.09 gm/cc
note: r_{Aeschynite-(Y)}=4.33 gm/cc.

Fermion Index

Fermion Index = 0.04005
Boson Index = 0.95995

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aeschynite-(Y) is Not Radioactive

Aeschynite-(Y) Classification

Dana Class:

8.3.6.3 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.6)Dana Group

8.3.6.1 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m

8.3.6.2 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

8.3.6.3 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m

8.3.6.4 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m

8.3.6.5 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m

8.3.6.6 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

Strunz Class:

IV/D.21-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.21 - Aeschynite series

IV/D.21-10 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-20 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m

IV/D.21-30 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m

IV/D.21-40 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m

IV/D.21-50 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-60 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-70 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m

IV/D.21-80 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
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: 8.3.6.3 Strunz No: IV/D.21-10
Locality:

Notes: