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Johnsomervilleite Mineral Data |
General Johnsomervilleite Information |
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Na2Ca(Mg,Fe++,Mn)7(PO4)6 | ||
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Molecular Weight = 955.37 gm | ||
Sodium 3.37 % Na 4.54 % Na2O | |||
Calcium 4.61 % Ca 6.46 % CaO | |||
Magnesium 7.89 % Mg 13.08 % MgO | |||
Manganese 4.03 % Mn 5.20 % MnO | |||
Iron 20.46 % Fe 26.32 % FeO | |||
Phosphorus 19.45 % P 44.57 % P2O5 | |||
Oxygen 40.19 % O | |||
______ ______ | |||
100.00 % 100.17 % = TOTAL OXIDE | |||
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Na1.4Ca1.1Fe2+3.5Mg3.1Mn2+0.7(PO4)6 | ||
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Accessory mineral in podiform metamorphic segregations in kyanite-sillimanite-grade gneiss. | ||
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Approved IMA 1980 | ||
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Glen Cosaidh, Loch Quoich,, Inverness-shire, Scotland. Link to MinDat.org Location Data. | ||
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Named for John M. Somerville (1908-1978), who collected the first specimen. | ||
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Johnsomervilleite + Pronunciation ![]() |
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Johnsomervilleite Image | |||
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Johnsomervilleite Crystallography |
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a:c = 1:2.84999 | ||
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a = 15, c = 42.75, Z = 18; V = 8,330.08 Den(Calc)= 3.43 | ||
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Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3 | ||
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By Intensity(I/Io): 2.764(1), 3.55(0.7), 3.7(0.7), | ||
Physical Properties of Johnsomervilleite |
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{0001} Perfect | ||
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Dark brown, Blackish gray. | ||
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3.35 | ||
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Transparent to Translucent | ||
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Brittle - Splintery - Brittle fracture leaving splintery fragments. | ||
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Colloform - Forming from a gel or colloidal mass. | ||
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Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite). | ||
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Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
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4.5 - Between Fluorite and Apatite | ||
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Vitreous (Glassy) | ||
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light brown | ||
Optical Properties of Johnsomervilleite |
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CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.191,KPDmeas= 0.1955,KC= 0.1896 Ncalc = 1.64 - 1.65 |
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Uniaxial (+/-), a=1.655, b=1.655, bire=0.0000. | ||
Calculated Properties of Johnsomervilleite |
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Bulk Density (Electron Density)=3.34 gm/cc note: Specific Gravity of Johnsomervilleite =3.43 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEJohnsomervilleite = 8.87 barns/electron U=PEJohnsomervilleite x rElectron Density= 29.62 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Johnsomervilleite is Not Radioactive |
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Johnsomervilleite Classification |
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38.02.05.02 (38)Anhydrous Phosphates, etc | ||
(38.02)(A+ B++)5 (XO4)3 | |||
(38.02.05)Fillowite Group | |||
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08.AC.50 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.A - Phosphates, etc. without additional anions, without H2O | |||
08.AC -With medium-sized and large cations | |||
Other Johnsomervilleite Information |
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NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Johnsomervilleite : 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 Johnsomervilleite using: Visit our Advertisers for Johnsomervilleite : Ask about Johnsomervilleite here : Print or Cut-and-Paste your Johnsomervilleite Specimen Label here :
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