Friedrichbeckeite
A valid IMA mineral species
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About Friedrichbeckeite
Formula:
K(◻Na)Mg2(Be2Mg)[Si12O30]
Colour:
Colorless to pale yellow
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.686 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named in 2009 by C. L. Lengauer, N. Hrauda, Uwe Kolitsch, R. Krickl, and E. Tillmanns, in honour of Friedrich Johann Karl Becke [December 31, 1855 Praha, Bohemia (Prague, Czech Republic) – June 18, 1931 Wien, Austria]. Becke was professor of mineralogy at the University of Czernowitz (Cernauti, Romania), at the German University (Praha), and the University of Wien. Becke was both a crystallographer and petrologist and in the latter field greatly influenced optical mineralogical theory from many important innovations. The Becke Line determination method of refractive index is named for him. Becke was also an important author and editor.
Osumilite Group.
Can be distinguished from its Mn analogue almarudite and from yellowish roedderite only by quantitative chemical analysis.
Can be distinguished from its Mn analogue almarudite and from yellowish roedderite only by quantitative chemical analysis.
Unique Identifiers
Mindat ID:
38698
Long-form identifier:
mindat:1:1:38698:8
GUID
(UUID V4):
(UUID V4):
4517086e-96fb-4517-9dfd-bdfea38f48cb
IMA Classification of Friedrichbeckeite
Classification of Friedrichbeckeite
9.CM.05
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Fri | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Fri | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Friedrichbeckeite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless to pale yellow
Streak:
White to pale cream
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.686 g/cm3 (Calculated)
Optical Data of Friedrichbeckeite
Type:
Uniaxial (+)
RI values:
nω = 1.552(2) nε = 1.561(2)
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Optical Extinction:
Anomalous extinction, slight biaxiality and zoning sometimes observed.
Pleochroism:
Visible
Comments:
O = yellow; E = light blue.
Chemistry of Friedrichbeckeite
Mindat Formula:
K(◻Na)Mg2(Be2Mg)[Si12O30]
Crystallography of Friedrichbeckeite
Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Cell Parameters:
a = 9.970 Å, c = 14.130 Å
Ratio:
a:c = 1 : 1.417
Unit Cell V:
1,216.36 ų (Calculated from Unit Cell)
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014649 | Friedrichbeckeite | Lengauer C L, Hrauda N, Kolitsch U, Krickl R, Tillmanns E (2009) Friedrichbeckeite, K(_0.5Na0.5)2(Mg0.8Mn0.1Fe0.1)2(Be0.6Mg0.4)3[Si12O30], a new milarite-type mineral from the Bellerberg volcano, Eifel area, Germany Mineralogy and Petrology 96 221-232 | 2009 | Bellerberg volcano, Eifel area, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.993 Å | (30) |
4.321 Å | (25) |
4.081 Å | (30) |
3.6898 Å | (30) |
3.5381 Å | (25) |
3.1799 Å | (100) |
2.8847 Å | (70) |
2.7374 Å | (25) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 3a: Earth’s earliest Hadean crust | >4.50 |
9 : Lava/xenolith minerals (hornfels, sanidinite facies) |
Type Occurrence of Friedrichbeckeite
General Appearance of Type Material:
Thin tabular crystals flattened on {0001}, with a maximum diameter of 0.6 mm and a maximum thickness of 0.1 mm.
Place of Conservation of Type Material:
Natural History Museum, Vienna, Austria (catalog no. 2009-IV-a).
Geological Setting of Type Material:
In vesicles in pyrometamorphically metasomatized silicate-rich xenoliths in leucite-tephrite volcanic rock.
Associated Minerals at Type Locality:
Synonyms of Friedrichbeckeite
Other Language Names for Friedrichbeckeite
German:Friedrichbeckeit
Relationship of Friedrichbeckeite to other Species
Member of:
Other Members of this group:
Agakhanovite-(Y) | K◻2(YCa)Be3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Almarudite | K◻2Mn2+2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
Aluminosugilite | KNa2Al2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Armenite | Ba(H2O)2Ca2Al3[Al3Si9O30] | Orth. mmm (2/m 2/m 2/m) : Pnna |
Berezanskite | K◻2Ti2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Brannockite | K◻2Sn2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Chayesite | K◻2Mg2(Mg2Fe3+)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Darapiosite | KNa2Mn2(Zn2Li)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Dusmatovite | K(K◻)Mn2+2Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Eifelite | KNa2(MgNa)Mg3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Klöchite | K◻2(Fe2+Fe3+)Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
Laurentthomasite | K◻2Mg2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Merrihueite | K(◻Na)Fe2+2Fe2+3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Milarite | K(◻H2O)Ca2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Oftedalite | K◻2(ScCa)Be3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Osumilite | K◻2Fe2+2Al3[Al2Si10O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Osumilite-(Mg) | K◻2Mg2Al3[Al2Si10O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Poudretteite | K◻2Na2B3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Roedderite | K(◻Na)Mg2Mg3[Si12O30] | Hex. 6 m2 : P62c |
Shibkovite | K(◻K)Ca2Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sogdianite | K◻2Zr2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sugilite | KNa2Fe3+2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Trattnerite | ◻(◻)2Fe3+2Mg3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
UM1990-73-SiO:KMnNaZn | K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30] | Hex. |
Unnamed (Mn3+-dominant analog of Sugilite) | KNa2Mn3+2Li3[Si12O30] | |
Yagiite | Na◻2Mg2Al3[Al2Si10O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Related Minerals - Strunz-mindat Grouping
9.CM. | Agakhanovite-(Y) | K◻2(YCa)Be3[Si12O30] |
9.CM.05 | Armenite | Ba(H2O)2Ca2Al3[Al3Si9O30] |
9.CM.05 | Brannockite | K◻2Sn2Li3[Si12O30] |
9.CM.05 | Chayesite | K◻2Mg2(Mg2Fe3+)[Si12O30] |
9.CM.05 | Darapiosite | KNa2Mn2(Zn2Li)[Si12O30] |
9.CM.05 | Eifelite | KNa2(MgNa)Mg3[Si12O30] |
9.CM.05 | Merrihueite | K(◻Na)Fe2+2Fe2+3[Si12O30] |
9.CM.05 | Milarite | K(◻H2O)Ca2(Be2Al)[Si12O30] |
9.CM.05 | Osumilite-(Mg) | K◻2Mg2Al3[Al2Si10O30] |
9.CM.05 | Osumilite | K◻2Fe2+2Al3[Al2Si10O30] |
9.CM.05 | Poudretteite | K◻2Na2B3[Si12O30] |
9.CM.05 | Roedderite | K(◻Na)Mg2Mg3[Si12O30] |
9.CM.05 | Sogdianite | K◻2Zr2Li3[Si12O30] |
9.CM.05 | Sugilite | KNa2Fe3+2Li3[Si12O30] |
9.CM.05 | Yagiite | Na◻2Mg2Al3[Al2Si10O30] |
9.CM.05 | Berezanskite | K◻2Ti2Li3[Si12O30] |
9.CM.05 | Dusmatovite | K(K◻)Mn2+2Zn3[Si12O30] |
9.CM.05 | Shibkovite | K(◻K)Ca2Zn3[Si12O30] |
9.CM.05 | Almarudite | K◻2Mn2+2(Be2Al)[Si12O30] |
9.CM.05 | Trattnerite | ◻(◻)2Fe3+2Mg3[Si12O30] |
9.CM.05 | Oftedalite | K◻2(ScCa)Be3[Si12O30] |
9.CM.05 | Klöchite | K◻2(Fe2+Fe3+)Zn3[Si12O30] |
9.CM.05 | UM1990-73-SiO:KMnNaZn | K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30] |
9.CM.05 | Laurentthomasite | K◻2Mg2(Be2Al)[Si12O30] |
9.CM.9.CM. | Aluminosugilite | KNa2Al2Li3[Si12O30] |
9.CM.10 | Faizievite | K2Na(Ca6Na)Ti4Li6[Si6O18]2[Si12O30]F2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Friedrichbeckeite
mindat.org URL:
https://www.mindat.org/min-38698.html
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References for Friedrichbeckeite
Reference List:
Localities for Friedrichbeckeite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Lengauer et al. (2009) |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany