Yimengite Mineral Data

General Yimengite Information

Chemical Formula:

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

Composition:

Molecular Weight = 837.35 gm

Potassium 4.20 % K 5.06 % K₂O

Barium 1.64 % Ba 1.83 % BaO

Magnesium 4.06 % Mg 6.74 % MgO

Titanium 20.01 % Ti 33.39 % TiO₂

Aluminum 2.26 % Al 4.26 % Al₂O₃

Chromium 29.19 % Cr 42.66 % Cr₂O₃

Iron 2.00 % Fe 2.86 % Fe₂O₃

Silicon 0.34 % Si 0.72 % SiO₂

Oxygen 36.30 % O

______ ______

100.00 % 97.52 % = TOTAL OXIDE

Empirical Formula:

K_0.9Ba_0.1Cr_4.7Ti_3.5Mg_1.4Al_0.7Fe³⁺_0.3Si_0.1O₁₉

Environment:

Metasomatic alteration product of chromian spinel in kimberlites.

IMA Status:

Approved IMA 1983

Locality:

Yimeng Mountain area, Shandong Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Yimengite + Pronunciation

Yimengite Image

Images:

Yimengite Diamond

Comments: Birefringence image of diamond displaying the location of yimengite inclusions (1, 2 , 3, 4, and 5) along the different octahedral growth zones. (Lithos, v77:181).
Location: Sese kimberlite (50 km) south of Masvingo, Zimbabwe. Scale: See Image.
© Lithos

Images:

Yimengite

Comments: SEM image of the yimengite-5 inclusion intergrown with chromite lamellae. (Lithos, v77:181).
Location: Sese kimberlite (50 km) south of Masvingo, Zimbabwe. Scale: See Image.
© Lithos

Yimengite Crystallography

Axial Ratios:

a:c = 1:3.90468

Cell Dimensions:

a = 5.875, c = 22.94, Z = 2; V = 685.71 Den(Calc)= 4.06

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.63(1), 1.622(0.9), 2.78(0.9),

Physical Properties of Yimengite

Cleavage:

{0001} Perfect, {1120} Good, {1011} Poor

Color:

Black.

Density:

4.34

Diaphaneity:

Opaque

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Luster:

Metallic

Streak:

brown

Optical Properties of Yimengite

Optical Data:

Uniaxial (?).

NCalc= 2.22 - from Gladstone-Dale relationship (KC = 0.3) where Ncalc=Dcalc*KC+1
NCalc= 2.3 - from Gladstone-Dale relationship (KC = 0.3) where Ncalc=Dmeas*KC+1

RL Color:

Gray to grayish white.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Yimengite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
402 nm	12.70	17.70
438 nm	11.30	18.20
498 nm	15.10	16.00
548 nm	15.70	16.20
588 nm	13.00	16.50
624 nm	13.50	16.70
641 nm	12.60	15.50

**Calculated Relative Intensity Colors of Yimengite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	690%
R₁
R₂

Calculated Properties of Yimengite

Electron Density:

Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Yimengite =4.06 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Yimengite= 18.09 barns/electron
U=PE_Yimengite x r_electron= 70.08 barns/cc.

Radioactivity:

GRapi = 57.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Yimengite per GRapi unit = 1.73 (%)

Estimated Radioactivity from Yimengite - barely detectable

Yimengite Classification

Dana Class:

07.04.01.02 (07)Multiple Oxides

(07.04)with O19 groups

(07.04.01)(Hexagonal, P63/mmc)

07.04.01.01 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

07.04.01.02 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

07.04.01.03 Hawthorneite Ba[Ti3Cr4Fe4Mg]O19 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

04.CC.45 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.45 Hawthorneite Ba[Ti3Cr4Fe4Mg]O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Diaoyudaoite NaAl11O17 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Magnetoplumbite Pb(Fe,Mn)12O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Haggertyite! Ba[Fe6Ti5Mg]O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Batiferrite! Ba(Ti2Fe8Fe2)O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Nezilovite! PbZn2(Mn,Ti)2Fe8O19 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Lindqvistite Pb2(Mn,Mg)Fe16027 P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Plumboferrite Pb2Fe(11-x)MnxO19-2x(x=1/3) P 6₃/mmc 6/m 2/m 2/m

04.CC.45 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

Other Yimengite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Yimengite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Yimengite here :
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Print or Cut-and-Paste your Yimengite Specimen Label here :

Yimengite

K(Cr,Ti,Fe,Mg)12O19
Dana No: 07.04.01.02 Strunz No: 04.CC.45
Locality:

Notes: