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Friedrichbeckeite Mineral Data
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General Friedrichbeckeite Information
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Chemical Formula: |
K([ ],Na)Mg2(Be2Mg)Si12O30 |
Composition: |
Molecular Weight = 982.67 gm |
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Potassium 3.46 % K 4.17 % K2O |
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Sodium 2.01 % Na 2.71 % Na2O |
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Magnesium 6.78 % Mg 11.24 % MgO |
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Manganese 1.57 % Mn 2.02 % MnO |
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Beryllium 1.68 % Be 4.66 % BeO |
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Iron 1.36 % Fe 1.75 % FeO |
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Silicon 34.30 % Si 73.37 % SiO2 |
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Oxygen 48.84 % O |
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______ ______ |
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100.00 % 99.93 % = TOTAL OXIDE |
Empirical Formula: |
K0.87Na0.86Mg1.57Mn2+0.28Fe2+0.24Be1.83Mg1.17Si12O30 |
Environment: |
Found in a single silicate-rich xenolith in volcanic rocks. Milarite group. Mg-dominant analogue of almarudite, milarite or oftedalite. |
IMA Status: |
Approved IMA 2008 (Dana # Added) |
Locality: |
Bellerberg, Ettringen, Eifel, Germany Link to MinDat.org Location Data. |
Name Origin: |
Named for Friedrich Johann Karl Becke (1855-1931), Austrian mineralogist and petrographer. |
Name Pronunciation: |
Friedrichbeckeite + Pronunciation |
Synonym: |
IMA2008-019 |
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Friedrichbeckeite Crystallography
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Axial Ratios: |
a:c = 1:1.41725 |
Cell Dimensions: |
a = 9.97, c = 14.13, Z = 2; V = 1,216.36 Den(Calc)= 2.68 |
Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc |
X Ray Diffraction: |
By Intensity(I/Io): 3.1799(1), 2.8847(0.7), 3.6898(0.3),4.081(0.3), 4.993(0.3), 2.7374(0.25), 3.5381(0.25), 4.321(0.25), |
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Physical Properties of Friedrichbeckeite
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Cleavage: |
None |
Color: |
Light yellow. |
Diaphaneity: |
Transparent |
Fracture: |
Brittle - Irregular - Very brittle fracture producing irregular fragments |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
6 - Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Friedrichbeckeite
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Gladstone-Dale: |
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2076,KC= 0.2069 Ncalc = 1.55 |
Optical Data: |
Uniaxial (+), w=1.552, e=1.561, bire=0.0090. |
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Calculated Properties of Friedrichbeckeite
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Electron Density: |
Bulk Density (Electron Density)=2.66 gm/cc note: Specific Gravity of Friedrichbeckeite =2.68 gm/cc. |
Fermion Index: |
Fermion Index = 0.04 Boson Index = 0.96 |
Photoelectric: |
PEFriedrichbeckeite = 2.65 barns/electron U=PEFriedrichbeckeite x relectron= 7.05 barns/cc. |
Radioactivity: |
GRapi = 49.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Friedrichbeckeite per GRapi unit = 2.02 (%)
Estimated Radioactivity from Friedrichbeckeite - barely detectable
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Friedrichbeckeite Classification
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Dana Class: |
63.02.01a.21 (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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63.02.01a.01 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.02 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m |
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63.02.01a.03 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.02.01a.04 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.06 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.07 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.08 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.09 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m |
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63.02.01a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.12 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m |
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63.02.01a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m |
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63.02.01a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m |
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63.02.01a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.02.01a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m |
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63.02.01a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m |
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63.02.01a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.02.01a.19 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m |
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63.02.01a.20 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.02.01a.21 Friedrichbeckeite! K([],Na)Mg2(Be2Mg)Si12O30 P 6/mcc 6/m 2/m 2/m |
Strunz Class: |
09.CX.00 09 - SILICATES (Germanates) |
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09.C - Unclassified Strunz Cyklosilicates |
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09.CX -Unknown |
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09.CX.00 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m |
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09.CX.00 Friedrichbeckeite! K([],Na)Mg2(Be2Mg)Si12O30 P 6/mcc 6/m 2/m 2/m |
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09.CX.00 IMA2009-004 KCa7Sn2Li3Si12O36F2 C 2/m 2/m |
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Other Friedrichbeckeite Information
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References: |
NAME( Mineralogy and Petrology) PHYS. PROP.(Mineralogy and Petrology) OPTIC PROP.(Mineralogy and Petrology) |
See Also: |
Links to other databases for Friedrichbeckeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Friedrichbeckeite Specimen Label here :
Friedrichbeckeite
K([ ],Na)Mg2(Be2Mg)Si12O30
Dana No: 63.02.01a.21 Strunz No: 09.CX.00
Locality:
Notes:
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