Yimengite Mineral Data

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.

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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

Diaphaniety:

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:

r_electron=3.88 gm/cc
note: r_Yimengite=4.06 gm/cc.

Fermion Index

Fermion Index = 0.06134
Boson Index = 0.93866

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)

Estimated Radioactivity from Yimengite - barely detectable

Yimengite Classification

Dana Class:

7.4.1.2 (7)Multiple Oxides

(7.4)with O19 groups

(7.4.1)(Hexagonal, P63/mmc)

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

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

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

Strunz Class:

IV/C.08-10 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.08 - Yimngite - Otjisumeite series

IV/C.08-10 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-20 Hawthorneite Ba[Ti3Cr4Fe4Mg]O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-22 Haggertyite! Ba[Fe6Ti5Mg]O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-25 Batiferrite! Ba(Ti2Fe8Fe2)O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-30 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-35 Nezilovite! PbZn2(Mn,Ti)2Fe8O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-40 Magnetoplumbite Pb(Fe,Mn)12O19 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-45 Zenzenite Pb3(Fe,Mn)4Mn3O15 P 6₃/mcm 6/m 2/m 2/m

IV/C.08-47 Lindqvistite Pb2(Mn,Mg)Fe16027 P 6₃/mmc 6/m 2/m 2/m

IV/C.08-50 Plumboferrite Pb2Fe(11-x)MnxO19-2x(x=1/3) P 6₃/mmc 6/m 2/m 2/m

IV/C.08-60 Bartelkeite PbFeGe3O8 P 2₁,P 2₁/m Mono

IV/C.08-70 Otjisumeite PbGe4O9 P1,P 1 Tri

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Yimengite

K(Cr,Ti,Fe,Mg)12O19
Dana No: 7.4.1.2 Strunz No: IV/C.08-10
Locality:

Notes: