General Riebeckite Information![]() [ ]Na2(Fe++3Fe+++2)Si8O22(OH)2 |
![]() Molecular Weight = 935.90 gm |
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Sodium 4.91 % Na 6.62 % Na2O |
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Iron 29.84 % Fe 23.03 % FeO / 17.06 % Fe2O3 |
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Silicon 24.01 % Si 51.36 % SiO2 |
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Hydrogen 0.22 % H 1.92 % H2O |
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Oxygen 41.03 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Na2Fe2+3Fe3+2(Si8O22)(OH)2 |
![]() Magmatic and metamorphic rocks. |
![]() Valid Species (Pre-IMA) 1888 |
![]() Socotra island, Indian Ocean, Yemen. Link to MinDat.org Location Data. |
![]() Named after the German traveler, Emil Riebeck (1853-1885). |
![]() Riebeckite + Pronunciation |
![]() ![]() Crocidolite - asbestos form |
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ICSD 38218 |
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PDF 19-1061 |
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Riebeckite Crystallography![]() a:b:c =0.5412:1:0.2956 |
![]() a = 9.769, b = 18.048, c = 5.335, Z = 2; beta = 103.6° V = 914.24 Den(Calc)= 3.40 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
![]() By Intensity(I/Io): 2.72(1), 8.42(1), 3.09(0.8), |
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| Physical Properties of Riebeckite![]() {110} Perfect, {???} Perfect |
![]() Blue, Black, Dark green. |
![]() 3.4 |
![]() Translucent to subtranslucent to opaque |
![]() Brittle - Uneven - Very brittle fracture producing uneven fragments. |
![]() Fibrous - Crystals made up of fibers. |
![]() Massive - Fibrous - Distinctly fibrous fine-grained forms. |
![]() Striated - Parallel lines on crystal surface or cleavage face. |
![]() 4 - Fluorite |
![]() Non-fluorescent. |
![]() Vitreous - Silky |
![]() Nonmagnetic |
![]() greenish brown |
| Optical Properties of Riebeckite![]() CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2035,KPDmeas= 0.2035,KC= 0.223 Ncalc = 1.76 ![]() Biaxial (-), a=1.68-1.698, b=1.683-1.7, g=1.685-1.706, bire=0.0050-0.0080, 2V(Calc)=62-78, 2V(Meas)=68-85. Dispersion strong, r < v. |
![]() greenish blue, deep blue, smoky green, yellow, or indigo blue. |
![]() grayish blue, light yellowish green, green, yellow, or deep violet blue. |
![]() yellowish brown, deep blue, violet blue, dark smoky green, or black. |
| Calculated Properties of Riebeckite![]() Bulk Density (Electron Density)=3.33 gm/cc |
note: Specific Gravity of Riebeckite =3.40 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PERiebeckite = 9.88 barns/electron |
U=PERiebeckite x rElectron Density= 32.88 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Riebeckite is Not Radioactive | Riebeckite Classification![]() 66.01.03c.05 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.01)with P=2 amphibole configuration |
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(66.01.03c)Group 4, the sodic amphiboles |
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![]() 09.DE.25 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family |
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| Other Riebeckite Information![]() NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
![]() Links to other databases for Riebeckite : |
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - EUROmin Project 7 - Ecole des Mines de Paris 8 - GeoScienceWorld 9 - Glendale Community College 10 - Google Images 11 - Google Scholar 12 - Handbook of Mineralogy (MinSocAm) 13 - Handbook of Mineralogy (UofA) 14 - HyperPhysics 15 - MinDAT 16 - Mineralienatlas (Deutsch) 17 - Online Mineral Museum 18 - QUT Mineral Atlas 19 - Ruff.Info 20 - Scandinavian mineral gallery 21 - WWW-MINCRYST Search for Riebeckite using: Visit our Advertisers for Riebeckite : A Bijoux Google Search for RiebeckiteAdam's Minerals Google Search for Riebeckite Cape Minerals Google Search for Riebeckite Dakota Matrix Minerals Google Search for Riebeckite Excalibur Mineral Corp. Google Search for Riebeckite Exceptional Minerals Google Search for Riebeckite John Betts Fine Minerals Search for Riebeckite McDougall Minerals Google Search for Riebeckite Mineral News Website Link Rock and Mineral Shows Google Search for Riebeckite Weinrich Minerals, Inc. Google Search for Riebeckite Ask about Riebeckite here : Print or Cut-and-Paste your Riebeckite Specimen Label here :
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