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Yimengite Mineral Data
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General Yimengite Information
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 Chemical Formula: |
K(Cr,Ti,Fe,Mg)12O19 |
| Composition: |
Molecular Weight = 837.35 gm |
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Potassium 4.20 % K 5.06 % K2O |
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Barium 1.64 % Ba 1.83 % BaO |
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Magnesium 4.06 % Mg 6.74 % MgO |
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Titanium 20.01 % Ti 33.39 % TiO2 |
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Aluminum 2.26 % Al 4.26 % Al2O3 |
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Chromium 29.19 % Cr 42.66 % Cr2O3 |
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Iron 2.00 % Fe 2.86 % Fe2O3 |
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Silicon 0.34 % Si 0.72 % SiO2 |
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Oxygen 36.30 % O |
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______ ______ |
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100.00 % 97.52 % = TOTAL OXIDE |
| Empirical Formula: |
K0.9Ba0.1Cr4.7Ti3.5Mg1.4Al0.7Fe3+0.3Si0.1O19 |
| 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  |
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Yimengite Image |
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Images:
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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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Images:
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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 |
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Yimengite Crystallography
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| 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 Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc |
| X Ray Diffraction: |
By Intensity(I/Io): 2.63(1), 1.622(0.9), 2.78(0.9), |
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Physical Properties of Yimengite
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| 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 |
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Optical Properties of Yimengite
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| Optical Data: |
Uniaxial (?). |
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 402 nm |
12.70 |
17.70 |
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| 438 nm |
11.30 |
18.20 |
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| 498 nm |
15.10 |
16.00 |
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| 548 nm |
15.70 |
16.20 |
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| 588 nm |
13.00 |
16.50 |
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| 624 nm |
13.50 |
16.70 |
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| 641 nm |
12.60 |
15.50 |
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Calculated Relative Intensity Colors of Yimengite in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
630% |
690% |
| R1 |
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| R2 |
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Calculated Properties of Yimengite
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| Electron Density: |
Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Yimengite =4.06 gm/cc.
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| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PEYimengite = 18.09 barns/electron
U=PEYimengite x relectron= 70.08 barns/cc.
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| Radioactivity: |
GRapi = 57.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Yimengite per GRapi unit = 1.73 (%)
Estimated Radioactivity from Yimengite  - barely detectable
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Yimengite Classification
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| Dana Class: |
07.04.01.02 (07)Multiple Oxides |
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(07.04)with O19 groups |
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(07.04.01)(Hexagonal, P63/mmc) |
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07.04.01.01 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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07.04.01.02 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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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 |
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04.C - Metal:Oxygen = 2:3, 3:5, and Similar |
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04.CC -With large and medium-sized cations |
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04.CC.45 Hawthorneite Ba[Ti3Cr4Fe4Mg]O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Diaoyudaoite NaAl11O17 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Magnetoplumbite Pb(Fe,Mn)12O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Haggertyite! Ba[Fe6Ti5Mg]O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Batiferrite! Ba(Ti2Fe8Fe2)O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Nezilovite! PbZn2(Mn,Ti)2Fe8O19 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Lindqvistite Pb2(Mn,Mg)Fe16027 P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Plumboferrite Pb2Fe(11-x)MnxO19-2x(x=1/3) P 63/mmc 6/m 2/m 2/m |
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04.CC.45 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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Other Yimengite Information
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| 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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Yimengite
K(Cr,Ti,Fe,Mg)12O19
Dana No: 07.04.01.02 Strunz No: 04.CC.45
Locality:
Notes:
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