Hibonite Mineral Data

Hibonite Mineral Data +

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General Hibonite Information

Chemical Formula:

(Ca,Ce)(Al,Ti,Mg)12O19

Composition:

Molecular Weight = 708.81 gm

Calcium 4.52 % Ca 6.33 % CaO

Lanthanum 1.96 % La 2.30 % La₂O₃

Cerium 1.98 % Ce 2.32 % Ce₂O₃

Magnesium 0.17 % Mg 0.28 % MgO

Titanium 3.38 % Ti 5.63 % TiO₂

Aluminum 39.59 % Al 74.80 % Al₂O₃

Iron 5.52 % Fe 7.10 % FeO

Oxygen 42.89 % O

______ ______

100.00 % 98.76 % = TOTAL OXIDE

Empirical Formula:

Ca_0.8Ce_0.1La_0.1Al_10.4Ti_0.5Fe²⁺_0.7Mg_0.05O₁₉

Environment:

In metamorphosed limestone, pyroxenite, gneiss, and granulate of the amphibolite to granulite facies.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Esiva, near Taolanaro (Fort Dauphin), and near Ambindandrakemba, Madagascar. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Hibon, who discovered the mineral.

Hibonite Image

Images:

Hibonite

Comments: Crystalline spire-like specimen of hibonite.
Location: Ambindandrakemba, Madagascar. Scale: 2.1 x 1.5 cm.
© John Veevaert

Hibonite Crystallography

Axial Ratios:

a:c = 1:3.93457

Cell Dimensions:

a = 5.564, c = 21.892, Z = 2; V = 586.94 Den(Calc)= 4.01

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): 2.505(1), 2.648(0.8), 2.812(0.6),

Crystal Structure:

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Bermanec V , Holtstam D , Sturman D , Criddle A J , Back M E , Scavnicar S , The Canadian Mineralogist , 34 (1996) p.1287-1297, Nezilovite, a new member of the magnetoplumbite group, and the crystal, chemistry of mognetoplumbite and hibonite

Physical Properties of Hibonite

Cleavage:

[0001] Good, [1010] Parting

Color:

Black, Black, Reddish brown.

Density:

3.84

Diaphaniety:

Opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

7.5-8

Luster:

Metallic

Streak:

reddish brown

Optical Properties of Hibonite

Dichroism (e):

gray.

Dichroism (w):

brownish gray.

Optical Data:

Uniaxial (-).

NCalc= 1.85 - from Gladstone-Dale relationship (KC = 0.2109) where Ncalc=Dcalc*KC+1
NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.2109) where Ncalc=Dmeas*KC+1

Calculated Properties of Hibonite

Electron Density:

r_electron=3.90 gm/cc
note: r_Hibonite=4.01 gm/cc.

Fermion Index

Fermion Index = 0.00599
Boson Index = 0.99401

Photoelectric:

PE_Hibonite= 22.00 barns/electron
U=PE_Hibonite x r_electron= 85.75 barns/cc.

Radioactivity:

GRapi = 4,081.56 (Gamma Ray American Petroleum Institute Units)

Hibonite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Hibonite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.81 cm	88,177	2.38E-06	4,081.56	1.34
100 gm / 3.62 cm	8,818	2.38E-07	408.16	0.13
10 gm / 1.68 cm	882	2.38E-08	40.82	0.01
1 gm / 7.81 mm	88	2.38E-09	4.08	0.00
0.1 gm / 3.62 mm	9	2.38E-10	0.41	0.00
0.01 gm / 1.68 mm	1	2.38E-11	0.04	0.00
0.001 gm / 0.78 mm	0	2.38E-12	0.00	0.00

Weight of pure Hibonite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.01 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.20 % Th) From Sum REE Elements ( 3.94 % REE)

Hibonite Classification

Dana Class:

7.4.1.1 (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.08-30 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 Hibonite Information

References:

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

See Also:

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

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Hibonite

(Ca,Ce)(Al,Ti,Mg)12O19
Dana No: 7.4.1.1 Strunz No: IV/C.08-30
Locality:

Notes: