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 Ravnï¿½s 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 (heulandite-Ca).

Name Pronunciation:

Heulandite-Ba + Pronunciation

Synonym:

IMA2003-001

Heulandite-Ba Image

Images:

Heulandite-Ba

Comments: BSE image of a heulandite crystal. Darker areas are enriched in Ca and Sr, while lighter areas are enriched in Ba. (Eur. J. Mineral, v17:143).
Location: Northern RavnÃ¥s silver prospect, southern Vinoren, Flesberg community, Buskerud county, Norway. Scale: Scale bar is 0.1 mm.
© Eur. J. Mineral

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 - Prismatic H-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),

Physical Properties of Heulandite-Ba

Cleavage:

{010} Perfect

Color:

Colorelss, White, Yellowish white, Pale biege.

Density:

2.35

Diaphaneity:

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
Ncalc = 1.5 - 1.51

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:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Heulandite-Ba =2.36 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

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)
Concentration of Heulandite-Ba per GRapi unit = 14.46 (%)

Estimated Radioactivity from Heulandite-Ba - barely detectable

Heulandite-Ba Classification

Dana Class:

77.01.04.01d (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.04)Heulandite and related species

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

77.01.04.01a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

77.01.04.01b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m

77.01.04.01c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

77.01.04.01d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m

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

77.01.04.02a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

77.01.04.02b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m

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

77.01.04.03a Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m

77.01.04.04 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m

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

Strunz Class:

09.GE.05 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GE -Chains of T10O20 Tetrahedra

09.GE.05 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

09.GE.05 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

09.GE.05 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m

09.GE.05 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m

09.GE.05 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

09.GE.05 Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m

Other Heulandite-Ba Information

References:

NAME( EurJMin, 17:143) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(EurJMin, 17:143)

See Also:

Links to other databases for Heulandite-Ba :
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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Heulandite-Ba

(Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O)
Dana No: 77.01.04.01d Strunz No: 09.GE.05
Locality:

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