Bellbergite Mineral Data

General Bellbergite Information

Chemical Formula:

(K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O)

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

Empirical Formula:

K_1.3Na_0.7Ca_5.3Sr_2.4Ba_0.3Al₁₈Si₁₈O₇₂•30(H₂O)

Environment:

Ca-rich xenoliths in leucite tephrite lava.

IMA Status:

Approved IMA 1993

Locality:

Bellberg volcano, Mayen, Laacher See area, Eifel, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Bellbergite + Pronunciation

Synonym:

ICSD 64728

IMA1990-057

PDF 45-1482

Bellbergite Image

Images:

Bellbergite

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

Axial Ratios:

a:c = 1:1.20718

Cell Dimensions:

a = 13.244, c = 15.988, Z = 1; V = 2,428.64 Den(Calc)= 2.20

Crystal System:

Hexagonal Space Group: P 6₃/mmc, P 6₂c-, P 6₃mc

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

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Colorless, White.

Density:

2.2

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bellbergite

Dichroism (e):

none.

Dichroism (w):

none.

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

Optical Data:

Uniaxial (-), e=1.507, w=1.522, bire=0.0150.

Calculated Properties of Bellbergite

Electron Density:

Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Bellbergite =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Bellbergite= 14.11 barns/electron
U=PE_Bellbergite x r_electron= 31.06 barns/cc.

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

Dana Class:

77.01.08.01 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.08)Unclassified zeolite species

77.01.08.01 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O) P 6₃/mmc, P 6₂c-, P 6₃mc Hex

77.01.08.02 Tschernichite (Ca,Na)(Si6Al2)O16•4-8(H2O) P 4/mmm 4/m 2/m 2/m

Strunz Class:

09.GD.20 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GD -Chains of 6-membered rings ï¿½ 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

References:

NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

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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Bellbergite

(K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O)
Dana No: 77.01.08.01 Strunz No: 09.GD.20
Locality:

Notes:

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