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Yimengite (Yimengit)

Collectors Summary

Color grau zu grauweiß
Streak color braun
Hardness (Mohs) 4.5
Solubility - verdünnte HCl oder HNO3
Crystal System hexagonal, P63/mmc

Chemism

Chemical formula

K(Cr,Ti,Fe,Mg)12O19

Chemical composition

Chrom, Eisen, Magnesium, Titan, Kalium, Sauerstoff

Unit weight: 940.180972 u; Number of atoms in the formula: 32

Info

Empirical formula:

K(Cr0.55Ti0.3Fe0.1Mg0.05)12O19

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

32.33

19

59.38

15.9994300

303.9891700
Magnesium

Mg

1.55

0.6

1.88

24.3050600

14.5830360
Potassium

K

4.16

1

3.13

39.0983100

39.0983100
Titanium

Ti

18.33

3.6

11.25

47.8671000

172.3215600
Chromium

Cr

36.50

6.6

20.63

51.9961600

343.1746560
Iron

Fe

7.13

1.2

3.75

55.8452000

67.0142400

Analysis wt%

K2O : 3.75, BaO : 1.61, SiO2 : 0.55, TiO2 : 29.15, Al2O3 : 1.61, Cr2O3 : 37.06, FeO : 18.36, MgO : 7.89 (Ref: Kexue Tongbao 83)

Strunz 9th edition incl. updates

4.CC.45

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
C: Metall: Sauerstoff = 2: 3,3: 5, und vergleichbare
C: Mit großen und mittelgroßen Kationen
45:Magnetoplumbit-Gruppe

Lapis Classification

IV/C.08-010

IV: OXIDE
C: Oxide mit Verhältnis Metall : Sauerstoff = 2:3 (M2O3 und verwandte Verbindungen)
8: Magnetoplumbit- Gruppe

Classification by Hölzel

4.CE.210

4: OXIDES
C: R2O3 Sesquioxides
E: Other complex Oxides, mostly hextrig
2: Hibonite-Magnetoplumbite-Group

Dana 8th edition

07.04.01.02

07: Multiple Oxides
04: Multiple Oxides with O19 groups
01: (Hexagonal, P63/mmc)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Magnetoplumbite group

Optical Properties

Color

grau zu grauweiß

Streak color

braun

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

194

Space Group

P63/mmc

Cell parameters a (Å)

5.875

Cell parameters b (Å)

-

Cell parameters c (Å)

22.940

Cell parameters a/b or c/a

3.905

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

685.709

X-Ray Powder Diffraction

3.837(70),
2.887(40),
2.768(100),
2.621(60),
2.417(30),
2.229(30),
1.620(50),
1.469(50)
XRD chart Yimengite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

273 (20g)

Density (g/cm³)

4.34

4.553 ( ρ calc. Mineralienatlas )

Instability

- verdünnte HCl oder HNO3

(Co-)Type locality

(Co-)Type locality

China/Shandong, Provinz/Linyi, Präfektur/Yimeng-Gebirge (Yimeng Shan)

Preface

Author (Name, Year)

Dong & Zhou & Lu & Peng, 1983

References

Dong Z, Zhou J, Ping Z (1983) Yimengite, K(Cr,Ti,Fe,Mg)12O19, a new mineral from China, Kexue Tongbao 15, 932-936

IMA group assignments

Other languages

German

Yimengit

Spanish

Yimengita

English

Yimengite

French

Yimengite

Russian

Имэнгит

Japanese

ﾘﾒﾝｶﾞｲﾄ

CNMNC (IMA)-Number

IMA 1982-046

CNMNC symbol

Symbol

Yim

Locations with GPS information