Mineralogy Database

Hawthorneite Mineral Data

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General Hawthorneite Information

Help on Chemical  Formula: Chemical Formula: Ba[Ti3Cr4Fe4Mg]O19
Help on Composition: Composition: Molecular Weight = 1,040.63 gm
   Barium     13.20 %  Ba   14.73 % BaO
   Magnesium   2.34 %  Mg    3.87 % MgO
   Titanium   13.80 %  Ti   23.03 % TiO2
   Chromium   19.99 %  Cr   26.14 % CrO
   Iron       21.47 %  Fe   27.62 % FeO
   Oxygen     29.21 %  O
             ______        ______ 
             100.00 %       95.39 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaTi3Cr4Fe2+4MgO19
Help on Environment: Environment: Formed during upper-mantle (75-100 km, 900-1,000 Deg C., 20-30 kbar) metasomatism of chromian spinel in peridotite xenolith in a kimberlite pipe. Included in spinel surrounded by li ndsleyite.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Bultfontein diamond mine, Kimberley, Cape Province, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Barry Hawthorne, formerly chief geologist (Diamonds), DeBeers Consolidated Mines, South Africa.
Help on Name Pronunciation: Name Pronunciation: Hawthorneite + Pronunciation Say HAWTHORNEITE
Help on Synonym: Synonym: ICSD 202256
  PDF 46-1469
 

Hawthorneite Image

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  Hawthorneite

Comments: Replacement-textured magnesian chromian spinel (dark gray, CHR) infiltrated by hawthorneite (H, medium gray). B&W polished section, PPL with oil immersion. (AmMin, v74:668).
Location: Metasomatized, harzburgitic xenolith from a diamondiferous kimberlite pipe in Kimberley, South Africa. Scale: See Image.
© American Mineralogist

Hawthorneite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.92778
Help on Cell Dimensions: Cell Dimensions: a = 5.871, c = 23.06, Z = 2; V = 688.36 Den(Calc)= 5.02
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): 2.616(1), 2.765(0.85), 2.414(0.49),
 

Physical Properties of Hawthorneite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Brown.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Metallic
 

Optical Properties of Hawthorneite

Help on Optical Data: Optical Data: Uniaxial (-).
  NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.2218) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak to moderate, in browns and grays.
Help on RL Bireflectance: RL Bireflectance: Weak to moderate.
Help on RL Color: RL Color: Light gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Hawthorneite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   19.50   18.10 
   
 420 nm   19.10   17.80 
 440 nm   18.80   17.50 
 460 nm   18.40   17.20 
 480 nm   18.10   17.00 
 500 nm   17.90   16.80 
 520 nm   17.70   16.60 
 540 nm   17.60   16.50 
 560 nm   17.40   16.40 
 580 nm   17.30   16.30 
 600 nm   17.20   16.20 
 620 nm   17.20   16.20 
 640 nm   17.10   16.10 
 660 nm   17.00   16.00 
 680 nm   17.00   16.00 
 700 nm   16.90   15.90 
Calculated Relative Intensity Colors of Hawthorneite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540%
R1                      
R2                      
 

Calculated Properties of Hawthorneite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Hawthorneite =5.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEHawthorneite = 70.35 barns/electron
U=PEHawthorneite x rElectron Density= 329.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hawthorneite is Not Radioactive
 

Hawthorneite Classification

Help on  Dana Class: Dana Class: 07.04.01.03 (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 Hawthorneite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.74,p668-675,1989) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Hawthorneite :
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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Hawthorneite

Ba[Ti3Cr4Fe4Mg]O19
Dana No: 07.04.01.03 Strunz No: 04.CC.45
Locality:

 

Notes:

 

 
   
 


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