Iwashiroite-(Y) Mineral Data

Iwashiroite-(Y) Mineral Data

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General Iwashiroite-(Y) Information

Chemical Formula:

YTaO4

Composition:

Molecular Weight = 333.85 gm

Yttrium 26.63 % Y 33.82 % Y₂O₃

Tantalum 54.20 % Ta 66.18 % Ta₂O₅

Oxygen 19.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

YTaO₄

Environment:

Dimorphous with formanite

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

Suishouyama pegmatite, Kawamata town, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the old prefectural name of Fukushima prefecture (Iwashiro).

Synonym:

IMA2003-053

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Iwashiroite-(Y) Crystallography

Axial Ratios:

a:b:c =0.9653:1:0.9374

Cell Dimensions:

a = 5.262, b = 5.451, c = 5.11, Z = 2; beta = 95.12° V = 145.99 Den(Calc)= 7.59

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 3.13(1), 2.95(0.94), 1.862(0.29),1.89(0.29), 2.73(0.26), 2.62(0.23), 1.614(0.2),

Physical Properties of Iwashiroite-(Y)

Color:

Amber brown, Brown.

Diaphaniety:

Translucent

Luster:

Vitreous - Adamantine

Optical Properties of Iwashiroite-(Y)

Optical Data:

NCalc= 2.19 - from Gladstone-Dale relationship (KC = 0.1574) where Ncalc=Dcalc*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Iwashiroite-(Y) in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	13.80	14.10
546 nm	13.60	13.80
589 nm	13.60	13.90
650 nm	13.70	14.00

**Calculated Relative Intensity Colors of Iwashiroite-(Y) in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	650%
R₁
R₂

Calculated Properties of Iwashiroite-(Y)

Electron Density:

r_electron=6.55 gm/cc
note: r_{Iwashiroite-(Y)}=7.59 gm/cc.

Fermion Index

Fermion Index = 0.00015
Boson Index = 0.99985

Photoelectric:

PE_{Iwashiroite-(Y)}= 683.22 barns/electron
U=PE_{Iwashiroite-(Y)} x r_electron=4,473.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Iwashiroite-(Y) is Not Radioactive

Iwashiroite-(Y) Classification

Dana Class:

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

(8.1)where A BO4

(8.1.3)Dana Group

8.1.3.1 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

8.1.3.2 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho

8.1.3.3 Iwashiroite-(Y) ! YTaO4 P 2/a 2/m

Strunz Class:

IV/X.00-00 IV - Oxides

IV/X - Unclassified Strunz Oxides

IV/X.00 - Oxide

Other Iwashiroite-(Y) Information

See Also:

Links to other databases for Iwashiroite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Iwashiroite-(Y) Specimen Label here :

Iwashiroite-(Y)

YTaO4
Dana No: 8.1.3.3 Strunz No: IV/X.00-00
Locality:

Notes: