General Roedderite Information![]() (Na,K)2(Mg,Fe++)5Si12O30 |
![]() Molecular Weight = 1,031.99 gm |
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Potassium 1.89 % K 2.28 % K2O |
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Sodium 3.34 % Na 4.50 % Na2O |
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Magnesium 8.83 % Mg 14.65 % MgO |
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Iron 6.76 % Fe 8.70 % FeO |
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Silicon 32.66 % Si 69.87 % SiO2 |
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Oxygen 46.51 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Na1.5K0.5Mg3.75Fe2+1.25Si12O30 |
![]() In vesicles in contact metamorphosed basement gneiss xenoliths in leucite tephrite (Bellerberg volcano, Germany); an accessory mineral in an enstatite chondrite (Indarch meteorite). Forms a series with eifelite. |
![]() Approved IMA 1966 |
![]() In the Indarch, Witchita County, and Canyon Diablo meteorites. Link to MinDat.org Location Data. |
![]() Named for Edwin Woods Roedder (1919- ), mineralogist, U.S. Geological Survey, who noted the synthetic compound. |
![]() Roedderite + Pronunciation |
![]() ![]() ICSD 68545 |
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PDF 23-76 |
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Roedderite Crystallography![]() a:c = 1:1.40792 |
![]() a = 10.139, c = 14.275, Z = 2; V = 1,270.86 Den(Calc)= 2.70 |
![]() Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc |
![]() By Intensity(I/Io): 3.57(1), 3.239(0.77), 2.922(0.67), |
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| Physical Properties of Roedderite![]() None |
![]() Blue green, Colorless, Yellow, Reddish brown. |
![]() 2.6 |
![]() Transparent |
![]() 5-6 - Between Apatite and Orthoclase |
![]() Vitreous (Glassy) |
![]() white |
| Optical Properties of Roedderite![]() CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1998,KPDmeas= 0.2075,KC= 0.204 Ncalc = 1.53 - 1.55 ![]() Uniaxial (+), w=1.537, e=1.542, bire=0.0050. |
| Calculated Properties of Roedderite![]() Bulk Density (Electron Density)=2.58 gm/cc |
note: Specific Gravity of Roedderite =2.60 gm/cc. ![]() Fermion Index = 0.02 |
Boson Index = 0.98 ![]() PERoedderite = 3.68 barns/electron |
U=PERoedderite x relectron= 9.48 barns/cc. ![]() |
GRapi = 27.10 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Roedderite | Roedderite Classification![]() 63.02.01a.14 (63)Cyclosilicate Condensed Rings |
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(63.02)6-membered rings |
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(63.02.01a)Milarite - Osumilite group (Milarite - Osumilite subgroup) |
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![]() 09.CM.05 09 - SILICATES (Germanates) |
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09.C - Cyclosilicates |
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09.CM -[Si6O18]12- 6-membered double rings (sechser-Doppelringe) |
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| Other Roedderite Information![]() NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
![]() Links to other databases for Roedderite : |
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 15 - WWW-MINCRYST Search for Roedderite using: Visit our Advertisers for Roedderite : A Bijoux Google Search for RoedderiteAdam's Minerals Google Search for Roedderite Cape Minerals Google Search for Roedderite Dakota Matrix Minerals Google Search for Roedderite Excalibur Mineral Corp. Google Search for Roedderite Exceptional Minerals Google Search for Roedderite John Betts Fine Minerals Search for Roedderite McDougall Minerals Google Search for Roedderite Mineral News Website Link Rock and Mineral Shows Google Search for Roedderite Weinrich Minerals, Inc. Google Search for Roedderite Ask about Roedderite here : Print or Cut-and-Paste your Roedderite Specimen Label here :
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