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Mieite-(Y) (Mieit-(Y))

Collectors Summary

Color bernstein gelb
Streak color weiß
Lustre Diamantglanz
Hardness (Mohs) 6
Cleavages nicht beobachtet
Fracture uneben
Crystal System orthorhombisch, Cmcm

Chemism

Chemical formula

Y4Ti(SiO4)2O[F,(OH)]6

Empirical formula (analysis)

Y3.13Dy0.20Gd0.17Yb0.08Nd0.08Sm0.07Er0.07Th0.05Tb0.03Ho0.03Lu0.03Ce0.02Tm0.02U0.02)Σ4.00 (Ti0.52Al0.44Fe0.01)Σ0.97(Si1.92P0.12)Σ2.04 O9[F3.83(OH)1.91]Σ5.74

Chemical composition

Silicium, Titan, Yttrium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 766.8380949495 u; Number of atoms in the formula: 23.66

Info

Empirical formula:

Y3.13Dy0.20Gd0.17Yb0.08Nd0.08Sm0.07Er0.07Th0.05Tb0.03Ho0.03Lu0.03Ce0.02Tm0.02U0.02)(Ti0.52Al0.44Fe0.01)(Si1.92P0.12)O9[F3.83(OH)1.91]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.25

1.91

8.07

1.0079470

1.9251788

Oxygen

O

22.76

10.91

46.11

15.9994300

174.5537813

Fluorine

F

9.49

3.83

16.19

18.9984033

72.7638844

Aluminium

Al

1.55

0.44

1.86

26.9815382

11.8718768

Silicon

Si

7.03

1.92

8.11

28.0855300

53.9242176

Phosphorus

P

0.48

0.12

0.51

30.9737612

3.7168513

Titanium

Ti

3.25

0.52

2.20

47.8671000

24.8908920

Iron

Fe

0.07

0.01

0.04

55.8452000

0.5584520

Yttrium

Y

36.29

3.13

13.23

88.9058520

278.2753168

Cerium

Ce

0.37

0.02

0.08

140.1161000

2.8023220

Neodymium

Nd

1.50

0.08

0.34

144.2430000

11.5394400

Samarium

Sm

1.37

0.07

0.30

150.3630000

10.5254100

Gadolinium

Gd

3.49

0.17

0.72

157.2530000

26.7330100

Terbium

Tb

0.62

0.03

0.13

158.9253420

4.7677603

Dysprosium

Dy

4.24

0.2

0.85

162.5001000

32.5000200

Holmium

Ho

0.65

0.03

0.13

164.9303220

4.9479097

Erbium

Er

1.53

0.07

0.30

167.2593000

11.7081510

Thulium

Tm

0.44

0.02

0.08

168.9342120

3.3786842

Ytterbium

Yb

1.81

0.08

0.34

173.0430000

13.8434400

Lutetium

Lu

0.68

0.03

0.13

174.9671000

5.2490130

Thorium

Th

1.51

0.05

0.21

232.0381100

11.6019055

Uranium

U

0.62

0.02

0.08

238.0289130

4.7605783

Strunz 9th edition incl. updates

9.AG.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
G: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in meist [6] und > [6] Koordination
25:

Lapis Classification

VIII/B.14-010

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
14: Kationen mit Koordinationszahlen zwischen [8] und [12]

Dana 8th edition

52.04.04.03

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
04: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or > [6] coordination
04: Natisite - Yftisite group

IMA status

anerkannt - CNMNC Newsletter No. 21, August 2014, page 799

Mineral status

anerkanntes Mineral

Optical Properties

Color

bernstein gelb

Streak color

weiß

Change in color

blaue Interferenzfarben

Lustre

Diamantglanz

max. Birefringence

0.021

Birefringence chart\! Mieite-(Y) title=Birefringence chart Mieite-(Y)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

α = 1.694(2)

RI value γ / ε

γ = 1.715(5)

2V angle

Biaxial

Pleochroism

keiner

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

63

Space Group

Cmcm

Cell parameters a (Å)

14.942(2)

Cell parameters b (Å)

10.633(2)

Cell parameters c (Å)

7.0365(8)

Cell parameters a/b or c/a

1.405

Cell parameters c/b

0.662

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

1117.947

Kristall structure

Neuer Strukturtyp, Struktur bestimmt

X-Ray Powder Diffraction

5.46(60), 4.26(70), 3.76(90), 3.54(80), 3.48(80), 2.68(100), 2.43(50), 2.16(80)

XRD chart Mieite-(Y)

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

Density (g/cm³)

4.61 (berechnet)

4.556 ( ρ calc. Mineralienatlas )

Cleavages

nicht beobachtet

Fracture

uneben

Radioactivity

kann radioaktiv sein da es Spuren von radioaktiven Elementen enthält

(Co-)Type locality

(Co-)Type locality

Japan/Honshu/Kinki, Region/Mie, Präfektur/Komono/Souri Valley

Type material

National Museum of Nature and Science, Amakubo, Tsukuba, Ibaraki, Japan

Collection number of type material

NSM-M43627

Preface

Associations

Quarz, Albit, K–Feldspat, Muskovit, Allanit-(Ce), Gadolinit-(Y), Magnesiorowlandit-(Y).

Author (Name, Year)

Ritsuro Miyawaki, Satoshi Matsubara, Kazumi Yokoyama, Masako Shigeoka, Koichi Momma and Sadaoki Yamamoto (2014)

References

Miyawaki, R., Matsubara, S.,Yokoyama, K., Shigeoka, M., Momma, K. and Yamamoto, S. (2014) Mieite-(Y), IMA 2014-020. CNMNC Newsletter No. 21, August 2014, page 799; Mineralogical Magazine, 78, 797-804.

Miyawaki, R., Matsubara, S., Yokoyama, K., Shigeoka, M., Momma, K., Yamamoto, S. - Mieite–(Y), Y4Ti(SiO4)2O[F,(OH)]6, a new mineral in a pegmatite at Souri Valley, Komono, Mie Prefecture, central Japan. Journal of Mineralogical and Petrological Sciences, 110 (2015), 135-144.

Other languages

German

Mieit-(Y)

English

Mieite-(Y)

CNMNC (IMA)-Number

IMA 2014-020

CNMNC symbol

Symbol

Mi-Y

Locations with GPS information