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Bellbergite Mineral Data

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General Bellbergite Information

Help on Chemical  Formula: Chemical Formula: (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O)
Help on Composition: Composition: Molecular Weight = 3,214.44 gm
   Potassium   1.58 %  K     1.90 % K2O
   Barium      1.28 %  Ba    1.43 % BaO
   Sodium      0.50 %  Na    0.67 % Na2O
   Strontium   6.54 %  Sr    7.74 % SrO
   Calcium     6.61 %  Ca    9.25 % CaO
   Aluminum   15.11 %  Al   28.55 % Al2O3
   Silicon    15.73 %  Si   33.65 % SiO2
   Hydrogen    1.88 %  H    16.81 % H2O
   Oxygen     50.77 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.3Na0.7Ca5.3Sr2.4Ba0.3Al18Si18O72•30(H2O)
Help on Environment: Environment: Ca-rich xenoliths in leucite tephrite lava.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Bellberg volcano, Mayen, Laacher See area, Eifel, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Bellbergite + Pronunciation Say BELLBERGITE
Help on Synonym: Synonym: ICSD 64728
  PDF 45-1482

Bellbergite Image

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Comments: Small colorless to white hexagonal crystals of bellbergite on matrix.
Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Bellbergite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.20718
Help on Cell Dimensions: Cell Dimensions: a = 13.244, c = 15.988, Z = 1; V = 2,428.64 Den(Calc)= 2.20
Help on Crystal System: Crystal System: Hexagonal Space Group: P 63/mmc, P 62c-, P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.8(1), 6.58(0.8), 2.21(0.7),2.95(0.7), 1.83(0.5), 2.5(0.5), 2.7(0.5),

Physical Properties of Bellbergite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bellbergite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2339,KPDmeas= 0.2339,KC= 0.2237
Ncalc = 1.49
Help on Optical Data: Optical Data: Uniaxial (-), e=1.507, w=1.522, bire=0.0150.

Calculated Properties of Bellbergite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Bellbergite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBellbergite = 14.11 barns/electron
U=PEBellbergite x relectron= 31.06 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 22.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Bellbergite per GRapi unit = 4.38 (%)

Estimated Radioactivity from Bellbergite - barely detectable


Bellbergite Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.08)Unclassified zeolite species Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O) P 63/mmc, P 62c-, P 63mc Hex Tschernichite (Ca,Na)(Si6Al2)O16•4-8(H2O) P 4/mmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GD.20 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GD -Chains of 6-membered rings � tabular zeolites
09.GD.20 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O) P 63/mmc, P 62c-, P 63mc Hex
09.GD.20 Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m
09.GD.20 Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m
09.GD.20 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m

Other Bellbergite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)
Help on See Also: See Also: Links to other databases for Bellbergite :
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

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Dana No: Strunz No: 09.GD.20





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