Friedrichbeckeite Mineral Data

General Friedrichbeckeite Information

Chemical Formula:

K([ ],Na)Mg2(Be2Mg)Si12O30

Composition:

Molecular Weight = 982.67 gm

Potassium 3.46 % K 4.17 % K₂O

Sodium 2.01 % Na 2.71 % Na₂O

Magnesium 6.78 % Mg 11.24 % MgO

Manganese 1.57 % Mn 2.02 % MnO

Beryllium 1.68 % Be 4.66 % BeO

Iron 1.36 % Fe 1.75 % FeO

Silicon 34.30 % Si 73.37 % SiO₂

Oxygen 48.84 % O

______ ______

100.00 % 99.93 % = TOTAL OXIDE

Empirical Formula:

K_0.87Na_0.86Mg_1.57Mn²⁺_0.28Fe²⁺_0.24Be_1.83Mg_1.17Si₁₂O₃₀

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

Friedrichbeckeite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Physical Properties of Friedrichbeckeite

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

Optical Properties of Friedrichbeckeite

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.

Calculated Properties of Friedrichbeckeite

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:

PE_{Friedrichbeckeite}= 2.65 barns/electron
U=PE_{Friedrichbeckeite} x r_electron= 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

Friedrichbeckeite Classification

Dana Class:

63.02.01a.21 (63)Cyclosilicate Condensed Rings

(63.02)6-membered rings

(63.02.01a)Milarite - Osumilite group (Milarite - Osumilite subgroup)

63.02.01a.01 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.02 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

63.02.01a.03 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.04 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

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

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

63.02.01a.08 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.09 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

63.02.01a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.12 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m

63.02.01a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

63.02.01a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

63.02.01a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

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

63.02.01a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

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

63.02.01a.19 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

63.02.01a.20 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m

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)

09.C - Unclassified Strunz Cyklosilicates

09.CX -Unknown

09.CX.00 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m

09.CX.00 Friedrichbeckeite! K([],Na)Mg2(Be2Mg)Si12O30 P 6/mcc 6/m 2/m 2/m

09.CX.00 IMA2009-004 KCa7Sn2Li3Si12O36F2 C 2/m 2/m

Other Friedrichbeckeite Information

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:

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