Heulandite-Ba Mineral Data

Heulandite-Ba Mineral Data +

General Heulandite-Ba Information

Chemical Formula:

(Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O)

Composition:

Molecular Weight = 2,990.65 gm

Potassium 0.48 % K 0.58 % K₂O

Barium 11.43 % Ba 12.77 % BaO

Sodium 0.25 % Na 0.34 % Na₂O

Strontium 0.88 % Sr 1.04 % SrO

Calcium 1.89 % Ca 2.64 % CaO

Aluminum 8.08 % Al 15.27 % Al₂O₃

Silicon 25.36 % Si 54.25 % SiO₂

Hydrogen 1.47 % H 13.10 % H₂O

Oxygen 50.15 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Ba_2.49Ca_1.41Sr_0.3K_0.37Na_0.33Al_8.96Si₂₇O₇₂·21.75(H₂O)

Environment:

Accessory mineral in hydrothermal veins of the Kongsberg silver deposit type. Chemical zoning is frequent, with transitions to heulandite-Ca and heulandite-Sr.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Northern Ravnås prospect, southern Vinoren, 14 km NNW of Kongsberg town, Kongsberg ore district, Flesberg community, Buskerud county, Norway. Link to MinDat.org Location Data.

Name Origin:

Named as the Ba-dominant analogue of heulandite.

Synonym:

IMA2003-001

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Heulandite-Ba Crystallography

Axial Ratios:

a:b:c =0.9933:1:0.4154

Cell Dimensions:

a = 17.738, b = 17.856, c = 7.419, Z = 1; beta = 116.55° V = 2,102.02 Den(Calc)= 2.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.973(1)(151), 3.978(0.97)(131), 4.65(0.66)(131),7.941(0.66)(200), 2.807(0.65)(621), 5.12(0.59), 3.181(0.56),

Crystal Structure:

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Larsen A O , Nordrum F S , Dobelin N , Armbruster T , Petersen O V , Erambert M , European Journal of Mineralogy , 17 (2005) p.143-153, Heulandite-Ba, a new zeolite species from Norway, Locality: Northern Ravnas silver prospect, southern Vinoren, Flesberg community,, Buskerud county, Norway (Kongsberg ore district)

Physical Properties of Heulandite-Ba

Cleavage:

[010] Perfect

Color:

Colorelss, White, Yellowish white, Pale biege.

Density:

2.35

Diaphaniety:

Translucent to transparent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Heulandite-Ba

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2157,KPDmeas= 0.2166,KC= 0.2142

Optical Data:

Biaxial (+), a=1.5056, b=1.5064, g=1.515, bire=0.0094, 2V(Calc)=36, 2V(Meas)=38. Dispersion r > v distinct.

Calculated Properties of Heulandite-Ba

Electron Density:

r_electron=2.33 gm/cc
note: r_{Heulandite-Ba}=2.36 gm/cc.

Fermion Index

Fermion Index = 0.0331
Boson Index = 0.9669

Photoelectric:

PE_{Heulandite-Ba}= 48.87 barns/electron
U=PE_{Heulandite-Ba} x r_electron= 113.98 barns/cc.

Radioactivity:

GRapi = 6.92 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Heulandite-Ba - barely detectable

Heulandite-Ba Classification

Dana Class:

77.1.4.1d (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.4)Heulandite and related species

77.1.4.1 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m

77.1.4.1c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

77.1.4.1d Heulandite-Ba ! (Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O) C 2/m 2/m

77.1.4.2 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

77.1.4.2a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

77.1.4.2b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m

77.1.4.3 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

77.1.4.3a Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

77.1.4.4 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m

77.1.4.5 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m

Strunz Class:

VIII/JX.00-00 VIII - Silicates

VIII/JX - Unclassified Strunz Tectosilicates

VIII/JX.00 - Heulandite Series

Other Heulandite-Ba Information

References:

NAME( EurJMin, 17:143) PHYS. PROP.(EurJMin, 17:143) OPTIC PROP.(EurJMin, 17:143)

See Also:

Links to other databases for Heulandite-Ba :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Heulandite-Ba Specimen Label here :

Heulandite-Ba

(Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O)
Dana No: 77.1.4.1d Strunz No: VIII/JX.00-00
Locality:

Notes: