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Yagiite (Yagiit)

Collectors Summary

Color durchsichtig
Streak color weiß
Hardness (Mohs) 5 - 6
Crystal System hexagonal, P6/mcc

Chemism

Chemical formula

NaMg2(AlMg2Si12)O30

Chemical composition

Aluminium, Magnesium, Natrium, Silicium, Sauerstoff

Unit weight: 964.2008084 u; Number of atoms in the formula: 48

Info

Empirical formula:

NaMg2(AlMg2Si12)O30

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

49.78

30

62.50

15.9994300

479.9829000

Sodium

Na

2.38

1

2.08

22.9897702

22.9897702

Magnesium

Mg

10.08

4

8.33

24.3050600

97.2202400

Aluminium

Al

2.80

1

2.08

26.9815382

26.9815382

Silicon

Si

34.95

12

25.00

28.0855300

337.0263600

Analysis wt%

SiO2 : 61.70, Al2O3 : 19.10, TiO2 : 0.80, FeO : 2.40, MgO : 10.50, Na2O : 3.70, K2O : 1.40 (Ref: American Mineralogist 69)

Strunz 9th edition incl. updates

9.CM.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
M: ~[Si6O18]12- sechser-Doppelringe
05:Milarit-Gruppe

Lapis Classification

VIII/E.22-070

VIII: SILIKATE
E: Ringsilikate
22: Doppelte Sechserringe [Si12O30] 12-; Milarit/Osumilith-Gruppe

Classification by Hölzel

9.CF.610

9: SILICATES
C: Cyclosilicates
F: ~[Si12O30]12--Rings Milarite-Group

Dana 8th edition

63.02.01a.10

63: Cyclosilicates Cyclosilicate Condensed Rings
02: Cyclosilicates Cyclosilicate Condensed Rings 6-membered rings
01a: Milarite - Osumilite group (Milarite - Osumilite subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Osumilite Group

Optical Properties

Color

durchsichtig

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.008

Birefringence chart\! Yagiite title=Birefringence chart Yagiite

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

1.536

RI value γ / ε

1.544

Ri mean

1.539

2V angle

Uniaxial (+)

Pleochroism

schwach; O = sehr hellblau, E= farblos

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

192

Space Group

P6/mcc

Cell parameters a (Å)

10.09

Cell parameters b (Å)

-

Cell parameters c (Å)

14.29

Cell parameters a/b or c/a

1.416

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

1259.926

X-Ray Powder Diffraction

7.12(30),
5.059(60),
3.726(50),
3.565(20),
3.228(100),
2.909(40),
2.765(50),
2.003(30)

XRD chart Yagiite

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

Physical Properties

Hardness (Mohs)

5 - 6

Density (g/cm³)

2.70 (berechnet)

2.541 ( ρ calc. Mineralienatlas )

Preface

Name from

Dr. Kenzo Yagi, Professor für Geologie, Universität Hokkaido, Sapporo, Japan

Author (Name, Year)

Bunch & Fuchs, 1969

References

American Mineralogist 54 (1969), 14

IMA group assignments

Other languages

German

Yagiit

English

Yagiite

French

Yagiite

Spanish

Yagiíta

Simplified Chinese

陨钠镁大隅石

Alternative Name

German

Jageiit

Spanish

Jageiita

Jageiite

Italian

Yagita

Yagite

Simplified Chinese

陨碱硅铝镁石

CNMNC (IMA)-Number

IMA 1968-020

CNMNC symbol

Symbol

Yag

Locations with GPS information