General Hibonite Information
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Chemical Formula: |
(Ca,Ce)(Al,Ti,Mg)12O19 |
Composition: |
Molecular Weight = 708.81 gm |
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Calcium 4.52 % Ca 6.33 % CaO |
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Lanthanum 1.96 % La 2.30 % La2O3 |
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Cerium 1.98 % Ce 2.32 % Ce2O3 |
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Magnesium 0.17 % Mg 0.28 % MgO |
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Titanium 3.38 % Ti 5.63 % TiO2 |
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Aluminum 39.59 % Al 74.80 % Al2O3 |
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Iron 5.52 % Fe 7.10 % FeO |
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Oxygen 42.89 % O |
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______ ______ |
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100.00 % 98.76 % = TOTAL OXIDE |
Empirical Formula: |
Ca0.8Ce0.1La0.1Al10.4Ti0.5Fe2+0.7Mg0.05O19 |
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. |
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Hibonite Image |
Images:
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Hibonite
Comments: Crystalline spire-like specimen of hibonite.
Location: Ambindandrakemba, Madagascar.
Scale: 2.1 x 1.5 cm.
© John Veevaert |
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Hibonite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.505(1), 2.648(0.8), 2.812(0.6), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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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
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Physical Properties of Hibonite
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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 |
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Optical Properties of Hibonite
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Dichroism (e): |
gray. |
Dichroism (w): |
brownish gray. |
Optical Data: |
Uniaxial (-). |
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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 |
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Calculated Properties of Hibonite
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Electron Density: |
relectron=3.90 gm/cc note: rHibonite =4.01 gm/cc. |
Fermion Index |
Fermion Index = 0.00599 Boson Index = 0.99401 |
Photoelectric: |
PEHibonite = 22.00 barns/electron U=PEHibonite x relectron= 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)
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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)
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Hibonite Classification
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Dana Class: |
7.4.1.1 (7)Multiple Oxides |
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(7.4)with O19 groups |
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(7.4.1)(Hexagonal, P63/mmc) |
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7.4.1.1 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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7.4.1.2 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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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 |
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IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds) |
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IV/C.08 - Yimngite - Otjisumeite series |
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IV/C.08-10 Yimengite K(Cr,Ti,Fe,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-20 Hawthorneite Ba[Ti3Cr4Fe4Mg]O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-22 Haggertyite! Ba[Fe6Ti5Mg]O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-25 Batiferrite! Ba(Ti2Fe8Fe2)O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-30 Hibonite (Ca,Ce)(Al,Ti,Mg)12O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-35 Nezilovite! PbZn2(Mn,Ti)2Fe8O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-40 Magnetoplumbite Pb(Fe,Mn)12O19 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-45 Zenzenite Pb3(Fe,Mn)4Mn3O15 P 63/mcm 6/m 2/m 2/m |
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IV/C.08-47 Lindqvistite Pb2(Mn,Mg)Fe16027 P 63/mmc 6/m 2/m 2/m |
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IV/C.08-50 Plumboferrite Pb2Fe(11-x)MnxO19-2x(x=1/3) P 63/mmc 6/m 2/m 2/m |
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IV/C.08-60 Bartelkeite PbFeGe3O8 P 21,P 21/m Mono |
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IV/C.08-70 Otjisumeite PbGe4O9 P1,P 1 Tri |
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Other Hibonite 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 Hibonite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 - HyperPhysics
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 -École des Mines de Paris
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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:
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