General Congolite Information![]() (Fe++,Mg,Mn)3B7O13Cl |
![]() Molecular Weight = 458.00 gm |
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Magnesium 4.78 % Mg 7.92 % MgO |
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Manganese 3.60 % Mn 4.65 % MnO |
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Iron 21.95 % Fe 28.24 % FeO |
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Boron 16.52 % B 53.20 % B2O3 |
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Chlorine 7.74 % Cl 7.74 % Cl |
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- %
Cl -1.75 % -O=Cl2 |
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Oxygen 45.41 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Fe2+1.8Mg0.9Mn2+0.3B7O13Cl |
![]() Found in insoluble residue from a drill core into sedimentary evaporites. |
![]() Approved IMA 1972 |
![]() Brazzaville, Congo. Link to MinDat.org Location Data. |
![]() Named for the locality. |
![]() ICSD 60504 |
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PDF 25-2 |
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Congolite Crystallography![]() a:c = 1:2.44175 |
![]() a = 8.6225, c = 21.054, Z = 6; V = 1,355.60 Den(Calc)= 3.37 |
![]() Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c |
![]() By Intensity(I/Io): 2.725(1), 3.05(0.8), 2.061(0.75), |
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Mouse
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| Physical Properties of Congolite![]() Light red. |
![]() 3.58 |
![]() Transparent |
![]() 6.5-7.5 |
![]() Vitreous (Glassy) |
| Optical Properties of Congolite![]() CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2205,KPDmeas= 0.2075,KC= 0.2169 Ncalc = 1.73 - 1.78 ![]() Uniaxial (-), e=1.731, w=1.755, bire=0.0240. |
| Calculated Properties of Congolite![]() Bulk Density (Electron Density)=3.25 gm/cc |
note: Specific Gravity of Congolite =3.37 gm/cc. ![]() Fermion Index = 0.04 |
Boson Index = 0.96 ![]() PECongolite = 8.32 barns/electron |
U=PECongolite x rElectron Density= 27.06 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Congolite is Not Radioactive | Congolite Classification![]() 25.06.02.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen |
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(25.06)Dana Type |
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(25.06.02)Boracite Group (Trigonal: R3c) |
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![]() 06.GA.10 06 - BORATES |
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06.G - Heptaborates and other Megaborates |
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06.GA -Tekto-heptaborates |
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| Other Congolite Information![]() NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
![]() Links to other databases for Congolite : |
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 Congolite using: Visit our Advertisers for Congolite : A Bijoux Google Search for CongoliteAdam's Minerals Google Search for Congolite Cape Minerals Google Search for Congolite Dakota Matrix Minerals Google Search for Congolite Excalibur Mineral Corp. Google Search for Congolite Exceptional Minerals Google Search for Congolite John Betts Fine Minerals Search for Congolite McDougall Minerals Google Search for Congolite Mineral News Website Link Rock and Mineral Shows Google Search for Congolite Weinrich Minerals, Inc. Google Search for Congolite Ask about Congolite here : Print or Cut-and-Paste your Congolite Specimen Label here :
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