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Iwashiroite-(Y)

Additional Functions

Collectors Summary

Color dunkel rotbraun, amber
Lustre Glasglanz bis Diamantglanz
Hardness (Mohs) 6
Cleavages gut (010) und undeutlich (001)
Fracture halbmuschelig
Crystal System monoklin, P2/a

Chemism

Chemical formula

YTaO4

Additional chem. information

Dimorph mit Formanit-(Y)

Chemical composition

Tantal, Yttrium, Sauerstoff

Unit weight: 333.851482 u; Number of atoms in the formula: 6

Info

Empirical formula:

YTaO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

19.17

4

66.67

15.9994300

63.9977200

Yttrium

Y

26.63

1

16.67

88.9058520

88.9058520

Tantalum

Ta

54.20

1

16.67

180.9479100

180.9479100

Analysis wt%

Ta2O5 : 40.64, Nb2O5 : 16.66, TiO2 : 0.41, Y2O3 : 29.10, Gd2O3 : 1.06, Dy2O3 : 2.38, Ho2O3 : 0.56, Er2O3 : 2.09, Yb2O3 : 3.33, Lu2O3 : 0.95, Ln2O3 : 40.55 (Ref: J.Min.Petrol.Sci.2006)

Strunz 9th edition incl. updates

4.DB.25

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
B: Mit mittelgroßen [Kationen]: Ketten kantenverknüpfter Oktaeder
25:Samarskit-Gruppe

Lapis Classification

IV/D.24-005

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)

Classification by Hölzel

4.DJ.465

4: OXIDES
D: Dioxides
J: Titanates, Niobates and Tantalates, C large, V medium ò 2
4: Fergusonite-Group

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkel rotbraun, amber

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz bis Diamantglanz

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 13.8, 14.1, 14.0
(546) 13.6, 13.8, 13.7
(589) 13.6, 13.9, 13.8
(650) 13.7, 14.0, 13.9

Reflection chart Iwashiroite-(Y)

Reflectivity Ø

13.81

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

13

Space Group

P2/a

Cell parameters a (Å)

5.262

Cell parameters b (Å)

5.451

Cell parameters c (Å)

5.110

Cell parameters a/b or c/a

0.965

Cell parameters c/b

0.937

Cell parameters α

90°

Cell parameters β

95.12

Cell parameters γ

90°

Z

2

Volume (ų)

145.986

X-Ray Powder Diffraction

3.13(100), 2.95(94), 2.73(26), 2.62(23), 1.890(29), 1.862(29), 1.614(20)

XRD chart Iwashiroite-(Y)

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

796 (50g)

Density (g/cm³)

7.1 ber.

7.594 ( ρ calc. Mineralienatlas )

Cleavages

gut (010) und undeutlich (001)

Fracture

halbmuschelig

Tenacity

spröde

Preface

Author (Name, Year)

Hori & Kobayashi & Miyawaki & Matsubara & Yokoyama & Shimizu, 2006

Additional Information

Bisher nur eine Art gefunden, in rötlichem Feldspat im Pegmatit

References

Journal of Mineralogical and Petrological Sciences (formerly Mineralogical Journal) 101 (2006), 170
Mineralien Welt 03/09, Steffen Jahn, Neue Mineralien

Other languages

German

Iwashiroit-(Y)

English

Iwashiroite-(Y)

Russian

Ивасироит-(Y)

Traditional Chinese

斜方鉭釔礦

Simplified Chinese

斜方钽钇矿

Alternative Name

Japanese

岩代石

CNMNC (IMA)-Number

IMA 2003-053

CNMNC symbol

Symbol

Iwa-Y

IDs

GUSID (Global unique identifier short form) VaGyPGQf6kO67FrYg-RBtQ
GUID (Global unique identifier) 3CB2A155-1F64-43EA-BAEC-5AD883E441B5
Database ID 4484