General Jeppeite Information Chemical Formula: |
(K,Ba)2(Ti,Fe+++)6O13 |
Composition: |
Molecular Weight = 641.51 gm |
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Potassium 7.31 % K 8.81 % K2O |
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Barium 14.98 % Ba 16.73 % BaO |
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Titanium 41.80 % Ti 69.73 % TiO2 |
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Iron 3.48 % Fe 4.98 % Fe2O3 |
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Oxygen 32.42 % O |
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______ ______ |
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100.00 % 100.25 % = TOTAL OXIDE |
Empirical Formula: |
K1.2Ba0.7Ti5.6Fe3+0.4O13 |
Environment: |
In a large, weathered lamproite plug. |
IMA Status: |
Approved IMA 1984 |
Locality: |
Wolgidee Hills, West Kimberley district, Western Australia. Link to MinDat.org Location Data. |
Name Origin: |
Named for John Frederick Biccard Jeppe (1920-), geologist of Nedlands, Western Australia, discoverer of the mineral. |
Name Pronunciation: |
Jeppeite |
Synonym: |
ICSD 200005 |
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PDF 37-426 |
| | Jeppeite Image
Images:
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Jeppeite Crystallography Axial Ratios: |
a:b:c =4.051:1:2.3777 |
Cell Dimensions: |
a = 15.543, b = 3.8368, c = 9.123, Z = 2; beta = 99.25° V = 536.98 Den(Calc)= 3.97 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 2.812(1), 2.99(1), 3.07(1), |
Crystal Structure:
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Mouse
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| Physical Properties of Jeppeite Cleavage: |
{100} Perfect, {201} Good |
Color: |
Black. |
Density: |
3.94 |
Diaphaneity: |
Opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Acicular - Occurs as needle-like crystals. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Sub Metallic |
Streak: |
light brown |
| Optical Properties of Jeppeite 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 Optical Data: |
Biaxial (?), a=2.13, b=2.21, g=2.35, bire=0.2200 |
Pleochroism (x): |
capri blue. |
Pleochroism (y): |
dark greenish brown. |
Pleochroism (z): |
dark olive buff. |
RL Bireflectance: |
Weak. |
RL Color: |
Gray, may have golden internal reflections. |
Reflectivity |
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| Calculated Properties of Jeppeite Electron Density: |
Bulk Density (Electron Density)=3.68 gm/cc |
note: Specific Gravity of Jeppeite =3.94 gm/cc. Fermion Index: |
Fermion Index = 0.08 |
Boson Index = 0.92 Photoelectric: |
PEJeppeite = 73.28 barns/electron |
U=PEJeppeite x relectron= 269.69 barns/cc. Radioactivity: |
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GRapi = 98.56 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Jeppeite - barely detectable | Jeppeite Classification Dana Class: |
08.07.09.01 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.07)Dana Type |
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(08.07.09)Dana Group |
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Strunz Class: |
04.CC.50 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.C - Metal:Oxygen = 2:3, 3:5, and Similar |
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04.CC -With large and medium-sized cations |
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| Other Jeppeite Information References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
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 Search for Jeppeite using: Visit our Advertisers for Jeppeite : A Bijoux Google Search for JeppeiteAdam's Minerals Google Search for Jeppeite Cape Minerals Google Search for Jeppeite Dakota Matrix Minerals Google Search for Jeppeite Excalibur Mineral Corp. Google Search for Jeppeite Exceptional Minerals Google Search for Jeppeite John Betts Fine Minerals Search for Jeppeite McDougall Minerals Google Search for Jeppeite Mineral News Website Link Rock and Mineral Shows Google Search for Jeppeite Weinrich Minerals, Inc. Google Search for Jeppeite Ask about Jeppeite here : Print or Cut-and-Paste your Jeppeite Specimen Label here :
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