Mineralogy Database

Yimengite Mineral Data

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General Yimengite Information

Help on Chemical  Formula: Chemical Formula: K(Cr,Ti,Fe,Mg)12O19
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K0.9Ba0.1Cr4.7Ti3.5Mg1.4Al0.7Fe3+0.3Si0.1O19
Help on Environment: Environment: Metasomatic alteration product of chromian spinel in kimberlites.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Yimeng Mountain area, Shandong Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Yimengite + Pronunciation Say YIMENGITE
 

Yimengite Image

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  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

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  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

Help on Axial Ratios: Axial Ratios: a:c = 1:3.90468
Help on Cell Dimensions: Cell Dimensions: a = 5.875, c = 22.94, Z = 2; V = 685.71 Den(Calc)= 4.06
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.63(1), 1.622(0.9), 2.78(0.9),
 

Physical Properties of Yimengite

Help on Cleavage: Cleavage: {0001} Perfect, {1120} Good, {1011} Poor
Help on Color: Color: Black.
Help on Density: Density: 4.34
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Selvage - As a reaction rim, surrounding the host mineral.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Metallic
Help on Streak: Streak: brown
 

Optical Properties of Yimengite

Help on Optical Data: 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
Help on RL Color: RL Color: Gray to grayish white.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Yimengite =4.06 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEYimengite = 18.09 barns/electron
U=PEYimengite x relectron= 70.08 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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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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:

 

 
   
 


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