Mineralogy Database

Jeppeite Mineral Data

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General Jeppeite Information

Help on Chemical  Formula: Chemical Formula: (K,Ba)2(Ti,Fe+++)6O13
Help on Composition: Composition: Molecular Weight = 641.51 gm
   Potassium   7.31 %  K     8.81 % K2O
   Barium     14.98 %  Ba   16.73 % BaO
   Titanium   41.80 %  Ti   69.73 % TiO2
   Iron        3.48 %  Fe    4.98 % Fe2O3
   Oxygen     32.42 %  O
             ______        ______ 
             100.00 %      100.25 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.2Ba0.7Ti5.6Fe3+0.4O13
Help on Environment: Environment: In a large, weathered lamproite plug.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Wolgidee Hills, West Kimberley district, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Frederick Biccard Jeppe (1920-), geologist of Nedlands, Western Australia, discoverer of the mineral.
Help on Name Pronunciation: Name Pronunciation: Jeppeite Say JEPPEITE
Help on Synonym: Synonym: ICSD 200005
  PDF 37-426
 

Jeppeite Image

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  Jeppeite

Comments: Dark brown crystalline granular jeppeite.
Location: Walgidee Hills, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jeppeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.051:1:2.3777
Help on Cell Dimensions: Cell Dimensions: a = 15.543, b = 3.8368, c = 9.123, Z = 2; beta = 99.25° V = 536.98 Den(Calc)= 3.97
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.812(1), 2.99(1), 3.07(1),
 

Physical Properties of Jeppeite

Help on Cleavage: Cleavage: {100} Perfect, {201} Good
Help on Color: Color: Black.
Help on Density: Density: 3.94
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: light brown
 

Optical Properties of Jeppeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3098,KPDmeas= 0.3122,KC= 0.3284
Ncalc = 2.29 - 2.3
Help on Optical Data: Optical Data: Biaxial (?), a=2.13, b=2.21, g=2.35, bire=0.2200
Help on Pleochroism (x): Pleochroism (x): capri blue.
Help on Pleochroism (y): Pleochroism (y): dark greenish brown.
Help on Pleochroism (z): Pleochroism (z): dark olive buff.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Gray, may have golden internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Jeppeite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   16.10   19.50 
   
 420 nm   15.50   18.90 
 440 nm   15.00   18.40 
 460 nm   14.50   18.00 
 480 nm   14.20   17.60 
 500 nm   13.90   17.30 
 520 nm   13.60   17.00 
 540 nm   13.40   16.80 
 560 nm   13.20   16.60 
 580 nm   13.10   16.50 
 600 nm   13.00   16.40 
 620 nm   12.90   16.20 
 640 nm   12.90   16.20 
 660 nm   12.90   16.10 
 680 nm   12.80   16.00 
 700 nm   12.80   16.00 
Calculated Relative Intensity Colors of Jeppeite in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 660%
R1                        
R2                        
 

Calculated Properties of Jeppeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Jeppeite =3.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEJeppeite = 73.28 barns/electron
U=PEJeppeite x relectron= 269.69 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 98.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Jeppeite per GRapi unit = 1.01 (%)

Estimated Radioactivity from Jeppeite - barely detectable

 

Jeppeite Classification

Help on  Dana Class: Dana Class: 08.07.09.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.07)Dana Type
  (08.07.09)Dana Group
 
08.07.09.01 Jeppeite (K,Ba)2(Ti,Fe)6O13 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.CC.50 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.50 Jeppeite (K,Ba)2(Ti,Fe)6O13 C 2/m 2/m
 

Other Jeppeite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Jeppeite :
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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Jeppeite

(K,Ba)2(Ti,Fe+++)6O13
Dana No: 08.07.09.01 Strunz No: 04.CC.50
Locality:

 

Notes:

 

 
   
 


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